diff --git a/stress/serp-dualpath-optimize.ts b/stress/serp-dualpath-optimize.ts
index 0395a5f..b4d8603 100644
--- a/stress/serp-dualpath-optimize.ts
+++ b/stress/serp-dualpath-optimize.ts
@@ -51,14 +51,28 @@ const JSONL = `${DATA}${LABEL}.jsonl`;
 const REQ_JSONL = `${DATA}${LABEL}-req.jsonl`;
 const LIVE = `${DATA}${LABEL}-live.json`;
 
-/** # 成员变量 长尾查询词表(A×B×C 组合,顺序消费避免重复) **/
-const A = ["best", "top rated", "cheap", "review of", "how to choose a", "buy", "compare", "2026 guide for", "price of", "warranty for"];
-const B = ["coffee maker", "running shoes", "laptop stand", "rice cooker", "air fryer", "standing desk", "office chair", "mechanical keyboard", "monitor arm", "webcam", "espresso machine", "vacuum cleaner", "electric kettle", "gaming mouse", "noise cancelling headphones", "desk lamp", "water bottle", "yoga mat", "blender", "space heater"];
-const C = ["for home use", "for small office", "under 100 dollars", "in 2026", "with long warranty", "for beginners", "pro model", "on sale", "quiet operation", "energy efficient"];
-const combos: string[] = [];
-for (const a of A) for (const b of B) for (const c of C) combos.push(`${a} ${b} ${c}`);
-let qi = Math.floor(Math.random() * combos.length);
-function nextQuery(): string { const q = combos[qi % combos.length]; qi++; return q; }
+/** # 成员变量 长尾查询词表(4 维组合,2026-10-30 用户反馈改版):
+ * 旧 A×B×C(2000 组合)相似度太高,/goto 解析缓存命中虚高,同 Profile 并发 /goto
+ * 的真实负载被洗掉。改为 修饰×品类×限定×城市 4 维(40×60×40×60 = 576 万组合),
+ * 随机不重复消费 —— 每次搜索结果集与 /goto 链接基本不同,缓存命中回落到真实水平。
+ */
+const A = ["best", "top rated", "cheap", "review of", "how to choose a", "buy", "compare", "2026 guide for", "price of", "warranty for", "where to buy", "discount on", "is it worth buying", "reliability of", "problems with", "alternatives to", "user reviews for", "long term test of", "repair costs for", "energy use of", "setup guide for", "maintenance tips for", "refurbished", "open box deals on", "wholesale price of", "used value of", "safety rating of", "recalled models of", "accessories for", "replacement parts for", "manual pdf for", "dimensions of", "weight limit of", "installation cost of", "monthly deals on", "black friday price for", "cyber monday deal for", "student discount for", "military discount for", "trade in value of"];
+const B = ["coffee maker", "running shoes", "laptop stand", "rice cooker", "air fryer", "standing desk", "office chair", "mechanical keyboard", "monitor arm", "webcam", "espresso machine", "vacuum cleaner", "electric kettle", "gaming mouse", "noise cancelling headphones", "desk lamp", "water bottle", "yoga mat", "blender", "space heater", "air purifier", "electric toothbrush", "smart thermostat", "robot vacuum", "ergonomic mouse", "usb-c hub", "portable ssd", "wireless charger", "dash cam", "action camera", "trail running shoes", "hiking backpack", "camping tent", "sleeping bag", "kayak paddle", "bicycle helmet", "electric scooter", "board games", "3d printer", "drawing tablet", "studio microphone", "audio interface", "midi keyboard", "electric guitar", "drum pad", "telescope", "binoculars", "bird feeder", "grill smoker", "pizza oven", "garden hose", "leaf blower", "chainsaw", "pressure washer", "snow shovel", "garage door opener", "stud finder", "laser level", "tool set", "sewing machine"];
+const C = ["for home use", "for small office", "under 100 dollars", "in 2026", "with long warranty", "for beginners", "pro model", "on sale", "quiet operation", "energy efficient", "with fast shipping", "highly rated", "compact size", "heavy duty", "for students", "for professionals", "with extra accessories", "easy to clean", "portable version", "premium edition", "budget option", "luxury model", "with 2 year warranty", "top ranked", "editor's choice", "best seller", "new release", "on clearance", "with free returns", "for tall people", "for small spaces", "made in usa", "eco friendly", "with app control", "voice assistant compatible", "wifi enabled", "with hepa filter", "waterproof model", "lightweight version", "industrial grade"];
+const D = ["in Austin tx", "in Denver co", "in Seattle wa", "in Portland or", "in Chicago il", "in Boston ma", "in Miami fl", "in Phoenix az", "in Dallas tx", "in Atlanta ga", "in New York ny", "in Los Angeles ca", "in Houston tx", "in Philadelphia pa", "in San Diego ca", "in Las Vegas nv", "in Nashville tn", "in Detroit mi", "in Minneapolis mn", "in Charlotte nc", "in Raleigh nc", "in Omaha ne", "in Boise id", "in Salt Lake City ut", "in Columbus oh", "in Indianapolis in", "in Milwaukee wi", "in Kansas City mo", "in St Louis mo", "in Cincinnati oh", "in Pittsburgh pa", "in New Orleans la", "in Memphis tn", "in Louisville ky", "in Albuquerque nm", "in Tucson az", "in Fresno ca", "in Sacramento ca", "in Portland me", "in Burlington vt", "in Providence ri", "in Hartford ct", "in Newark nj", "in Baltimore md", "in Richmond va", "in Charleston sc", "in Savannah ga", "in Orlando fl", "in Tampa fl", "in San Antonio tx", "in El Paso tx", "in Oklahoma City ok", "in Tulsa ok", "in Wichita ks", "in Des Moines ia", "in Little Rock ar", "in Jackson ms", "in Billings mt", "in Fargo nd", "in Charleston wv", "in Eugene or"];
+const COMBO_TOTAL = A.length * B.length * C.length * D.length;
+/** # 成员变量 已消费组合索引(随机不重复;24h 全程用量远低于组合空间,碰撞回退微乎其微) **/
+const usedCombos = new Set<number>();
+function nextQuery(): string {
+  let idx = Math.floor(Math.random() * COMBO_TOTAL);
+  while (usedCombos.has(idx)) idx = (idx + 1) % COMBO_TOTAL;
+  usedCombos.add(idx);
+  const d = idx % D.length;
+  const c = Math.floor(idx / D.length) % C.length;
+  const b = Math.floor(idx / (D.length * C.length)) % B.length;
+  const a = Math.floor(idx / (D.length * C.length * B.length)) % A.length;
+  return `${A[a]} ${B[b]} ${C[c]} ${D[d]}`;
+}
 
 // ============================================================================
 // 自适应令牌桶(速率由控制器动态调整)