same problem as me
then i found that quarymill leves for weaver can give diremite web
i forgot about lvl 30 leves but lvl 20 and lvl 25 got 1 leves repeatable 3 times which reward 10 web per repeat
the only problem is it not always give diremite web as reward and the only way to change reward is by complete 1 of it leves and other leves reward auto change

what i do is i get all weaver leves that reward diremite web,then complete 1 of it and recheck the other leves reward (good thing leves you take wont change reward anymore)

but yeah i agree about annoying to hunt it from mob,i hope SE will mass ban them