There should really be more spawns, I agree. But unless your server is truly riddled with bots given the sole purpose of farming fleece, it should be fairly simple to compete for the spawns.

I've been doing my story quest in that area lately and will occasionally take a break to farm up some fleece for my weaver. Even competing against several level 50s as my 38 monk, I've managed to get something like 60-70 fleece in the span of maybe 2 hours of on-and-off farming.

Also, if getting fleece really is impossible you should just do tradecraft leves for weaver that are 5-10 levels lower than you. Spam the ones that require 3 items with HQ turnins and rake in the exp. My goldsmith basically went from 35-49 off of just one level 35 leve done over and over again, using HQ turnins each time.