For your nutes, you mention Sugar Peak. Which formula are you using, (what are the N-P-K numbers?) and what are the dilution strengths recommended on the bottle?
Can lower the water ph with lemon juice or vinegar in a pinch...a couple or few drops per gallon is a good place to start. Fluctuating ph will lock-out nutes and micro's. Are you giving any superthrive, or similar micro nutes?