I think the PS2's give more grip than the stock GY's. I don't see a problem with the tire sizes you're going with. You should like the PS2's better than the stock tires.
I decided to go a different route, and I love them!
Good luck,
Alex

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2003 Z06 - Tint | C6 Z06 Shifter w/Knob | GHL 2-Tip Magnums | Z06 Exhaust Plate | Hood Seal | Zip-Tie Intake | 1-4 Shift Defeat | NGK TR 55s | Nitto 555 RIIs.
My BPP Shifter Broke In Two!!
Bad Slave Cylinder = New Clutch