I love the wasp also but it is very similiar to the roc and buzz as far as grip, it sounds like you dont like the thickness of a midrange which is hard to get use to but necessary i would try maybe a panther or cobra from innova or even stingray and those are a little thinner and may help the transition
try a stratus from discraft. throw on a little hyzer and it will go straight for 250 or so. and u can use them for much shorter approaches than that. also comets are great, umm discraft apx's are great short dead nuts straight putter approach discs. then also if u want an overstable or FH mid try a innova gator. but if u try a gator make sure its champion or cfr cuz they have beads are are more overstable.