Full Moon is April 22, I usually try and fish often 2 to 3 days prior and during the Full Moon. In my experience it is when most of the bigger crappie will be in the shallows.
I would concentrate on water 6'-10' until then.
Thread fin shad spawn will also concentrate both bass & crappie in a small area of the lake.
The first 5 days after the Weekend are the Hardest.