Drop the EQ and NPP. Bump Tren to 300 if you tolerate it. Lower Test to 400–500 to keep estrogen in check. Add 300 Mast if you want a cleaner, harder...
I've had similar neck and back issues and found some affordable options like free YouTube routines (Bob & Brad, PostureCoach), posture tracking apps...
If you're aiming for more quality mass, maybe bump test a bit and consider dropping either tren or NPP to manage sides better. EQ at 600 is good, but...