Make sure you don't have anymore then a +9 degrees pitch, if that is to much ( it shouldn't be) then drop it back to +8, don't go any lower the that. If that doesn't work then try to lean it out a couple of clicks on the needle. The OS32 should be able to pull a +9. All you can do is play with it and see what happens. It could be in your pitch/throttle courves, you mite have to play with them to. It's hard to tell without seeing it. You mite won't to find someone that knows about heli's to have a look at it for you.