Mickey Thompson ET street r

Hey all, I have a 19 hellcat and thinking about getting some stickies. Car is currently lowered on Eighbachs with 20x11 ferrada fr4s wrapped with 315 555r2's. I have read some posts but nothing clear to me on a few questions. I plan on changing the gears to 3.09's in the near future (when time permits). I have the diff but time is hard to come by with 2 littles. Would it be better to run a 305/45/17 or 315/50/17? I really don't want to take a slege hammer to the typical spots where it would rub. But if gearing is an issue I'll have to rethink my game plan. Any help and suggestions is much appreciated.