Yellowing Problems

Okay I'm about 4 1/2 weeks into vegging and about to start flowering. This first plant has been through hell already one branch was accitdently broke off and the othere one bended to shit. The problem im having is the yellow leaves. I am using fox farm nutes full lineup (started with 1/4 strength now up to full) and fox farm ocean forest. The first plant appears to have slight nute burn also. I want to diagnose this now so i can get the problem fixed.

Some more pics i forgot to add

Since the new growth isn't yellow, you should be ok for N. You probably need some K and maybe more P.

any other ideas