I've been having a similar problem with my NexStar (turning to the right during/immediatly after takeoff). I've learned to control it with the rudder, but it's still a little hairy at times. I had one of the more experienced instructors take it off last weekend and he said it seems like the right wing has a tendency to drop (not a good thing). I still have the wing extensions on there (the flaps came off after the first weekends flights), and plan to take them off before flying this weekend. There does seem to be an excessive amount of right thrust, so if removing the droops doesn't help with the problem, reducing the right thrust is next.

I want to get a little more comfortable flying this before I move on to my BigStik which I plan to build as a tail dragger.