Need tire size help!! R compounds!!

Push370zzz

I need some R6's for the track and am stuck. I have the sport package and a spare set of OEM 18's that currently have R6's in the size of 245 F/285 R on them. I would prefer to get my next set for the 19's because the height of the tire would be closer to stock since the profile is only about 30/35 on the 18's or 19's. Anyways the place I get them from only have 235/295/325 width in the 19's. Can I run a 295 front and 325 rear on the stock 19" rays safely or will I have problems?? I had issues with scrubbing the front tires (rears still have another day in them) due to massive understeer, so I got some swaybars on the way to help with that. Would too wide of tire make this problem worse?

I could do it safe and run 235 F/295 R but that's no fun for the fronts!! I saw a 370z with 295 front A6 yesterday at an autocross event that looked fine (and drove well) but I'm nervous about rubbing in the rear and front for that matter with such a wide tire. I suppose I could also do 295 at all corners but like the staggered set up best, and 235 seems like it would be a downgrade from my 245 F 18's now...

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Range Rover Sport Supercharged
Nissan 370z Touring + Sport