In the summer after the shad spawn the stripers will be slurping in the main channel feeding on small schools of shad on the surface. In early August it starts to erupt into biger boils as the shad get bigger and the stripers school up to more effectively feed.
Topwater = Super spooks (speckled sea trout) or any other shade immitation.
1/4th oz jighead with anchovies pieces on them in the middle of canyons on lake powell. Chum with the anchovies when you mark schools of stripers.
Deep diving shad immiation crankbaits/plugs.
Before you go, let me know and I will set you up with the pattern to look for.
for more info.