I fish the same water that you do. Lake Verret, Grassy, Bayou Black. I use cork about 95% of the time. When the cork layes flat, twichhes while falling back after I pop the cork all equals a hook set. Also alot of times you think its a perch messing with the jig tail but have sac a lait bite the same way. Basically any funny movement of the cork - I set the hook.