Thought I would add a few things here. I'm no expert, so don't flame me if I'm wrong or you don't agree.

First, the NextStar is an ARF like my Xtra Easy II. Things can be sloppy or just not right with any ARF. I've flown several and seen a few more. You can expect to find anything on ARF trainers and they should be inspected with a critical eye.

My XE2 has too much down thrust. It looks like it is angled down too much. I put a 2 bladed prop on it the other day and I nosed it over into the grass when I gave it too much throttle for takeoff. It bent the nose gear over and went right on down. Nothing was damaged. I've always thought it was pushing down too much when I was using the 3 bladed prop (Evo .45 trainer engine.) It takes off fine if I ease on the throttle and hold up elevator like a taildragger.

Gyroscopic precession means that if you apply a tilting force on a spinning object, like a propellor or rotor system, the action will take place 90 degrees later. This is why we looked silly trying to hold spinning bicycle wheels in our hands while figuring out how to tilt them. We all did that, right? Same reason we looked dumb the first time we hijacked the school floor buffer for laughs and it kept zinging around knocking over chairs, hitting buddies ankles, etc.