there are two things you can do, one is that when you cast you cast out a fairly shallow diver for your area, but put your rod tip in the water and slowly bring it out as you come closer.
or switch to rattle traps, then just either buzz the top or actually get them snagged and rip them out to try and get some reaction strikes.
and also i have found it really isn't good to cast straight in front of you, cast to the sides, then you get less snagges, and your in the strike zone longer.