A full 7 weeks ago you were complaining about the same problem.
So you're saying you've still continued to gain size (at 20% bodyfat) without significant progress in strength? Dude, your training and your nutrition are seriously screwed. It's not your CNS and it's not something ZMA can help with.
Lay out your week's training plan (the days, exercises, sets, and reps) and an outline of how you're eating (specifically what you ate yesterday).
Also, what are your current maxes in the basic lifts, what were they 7 weeks ago when you started that thread, and what were a few months before that?