JG BAR 10 Inconsistency HELP

I created a video to illustrate my problem
which you can view here: Basically my gun is not shooting consistently straight. the bullets could go up, down, too high or way too low but there is no telling what the next shot could do. I believe it could be to do with my hop up bucking but I am not familiar with what internal parts do what.
My upgrades include : 6.02 inner barrel, airsoft pro arm, Mad Bull rubber and a 440 fps spring.
Any help or advice would be greatly appreciated.