Do you mean 1/4" risers or 1/8" risers? You shouldn't need risers at all with 52mm wheels. Are they standard Indys or the Indy lows? I've always ridden regular Indys.
How tight are your trucks? If you just left the stock setting, you can tighten your trucks a tiny bit, like one turn, and that may cut down on wheelbite while still allowing good turning response.
Also trucks that are .25 *wider* than your deck will help cut down on wheelbite, as will a deck with a little more concave.
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Tighten trucks or lose weight.
I weigh 140 and there is no way i'm tightening my trucks.
I've got 1/4 risers on right now and my trucks are .25 smaller than my board.
I'm just going to start waxing under my wheels.