I did eventually manage to lure them away long enough for me to craft my Vellum (using it for scar patterns), but it took a while and was annoying to do so. Before today there were never any avicara anywhere near the the crafter and I could easily just run up there.
I'm just wondering if Anet have, for some reason, purposely done this to make it harder to get to, or have I just had unlucky spawns each time?

Anyone else notice this?