Sounds like the 33's are a re-pitched 34. The 34 has issues with getting on plane.
Call Brett Anderson at BBades (they are an OSO advertiser) and he can tell you what is necessary to get that fixed. The 34 is a �odd� prop, I had the same problems when I tried a set.
I have a TG TS w/575's too. What to sell your old 33's? Sounds like after the whipples, your labbed 33's will be too small. ??