F Yew longbow — patient spread flip killed

Yew longbow is a high-volume herblore intermediate that fends can make at ~1,800 gp/hr each. Buy-side are patient flippers and smithing alts dumping stock; sell-side are ranged/maged players who want the bow now. Neither side places patient patience-rich limit offers, so the GE-implied spread reopens to ~15-30 gp at ~570/540 over the day. The 21-day daily band is 494-558 gp and flat, so the sell leg is not eaten by a trend. Vol24h ~891k units, ~9x the per-cycle buy limit (18,000), so the 15% share constraint lets one full buy limit fill comfortably inside one window.

Entry: place buy offer at 541 gp; refresh if not filled in 5 min, cancel if ask lifts above 555
Exit: place sell offer at 572 gp; refresh if not filled in 5 min, cancel if bid falls below 550

Kill switch: Live margin below 10 gp for 4 consecutive hours; OR 21-day close band breaks below 480 (lower-edge violation = downtrend started); OR vol24h drops below 400k for two consecutive sweeps (liquidity evaporated - participation assumption fails).

From run 459 · F-yew-longbow-20260801