rolling upwards=acute heat stress.
acidboy, damage you will see as the plant suffers being rootbound is leaves curling under like canoe leaves, difficulty maintaining a balance between def and burn, SEVERE impact on yield, and general malaise. Plus after reading this whole thread over again, I think that inadequate soil is DEFINITELY hurting your ability to maintain pH. It will also mean you will have a bitch of a time keeping the plant properly watered.
5 gallon pails do not come pre-drilled, but that's what a 1/2" paddle bit is for.