The next time you are getting ready to fly your profile, set the carb to your liking, then while holding onto it, point the nose straight up with control surfaces at neutral. Take note to see if your plane tries to pull to it's belly. I was playing around with mine the other day and noticed that three of them do the same thing. If I tip the nose back quite a ways, it will of course, pull to the canopy side. I could see how some up-thrust would stop this, but I wonder if anyone else notices the same thing? Maybe it is a thrust thing? Maybe I need to change something? Comments and suggestions welcome.