Plane needs trimming after one missile is shot of course, but when you shoot say both magics, well magically it assumes that it also needs trimming. Same with 530s. Every time you shoot missile plane starts drift sideways. In my logic it should only drift if it's unbalanced (only one missile shot from other side). Also when then trimming, you can never trim it well, plane turns left > trim once to right and plane starts to turn right, trim once to left and then plane again turns left. "Steps" are too big to get plane flying straight level when trimming.