It would also depend on forage available...as if there isn't any hanging out near the few shallow areas...the predators will be chasing the schools out in open water away from the banks.
JMHO...and we could use better info. If we could find an online map...or even see a drawing of the depths...it would be of great help.
Jigs...jigging spoons (Kastmaster)...deeper running cranks running parallel with the bank.
I'd be inclined to invest in a float tube to get out further.
Take a look at the map (tif or pdf) of the lakes on this webpage...and are these anything like yours?
I grew up about 35 miles away from these