I don't vulch very often. Mostly because i can't aim for @#%*$! I do see wirbles camping under furballs but the worst is the flood of wirbles into towns. The wirble has become (from what i"ve seen) the most used town killer.
They seem to be landing a lot of kills. Aside from spawn campers, i'd say they are landing more kills than any other gv (again - from what i've seen). The wirble is pretty lethal to anything inside of 1.0k. How many 20mm equipped fighters can say that?
How about a compromise on the perk issue? Keep the status quo on wirbles upped on base and a 5 perk cost to go to a remote spawn. This will keep vulching in check and maybe we'll see ostis again on offensive sorties.