I discovered some or most of the trim problem. I bought the plane from a guy and put back into it the same motor servos etc. I just took for granted that everything was lined up and set.
Now I just went and bought a digital level, blocked everything up nice and level and started taking some measurements. First it had no right thrust according to my measuring and math. Second it had 2.5* of UP thrust. It now has 1.5* down and 2* right. I will start from there and after some flights and observations I will try to mix out what's left.