Test fitted some wheels.
F - 9 +30, 255
R - 10 +38, 295
With about 2.5 deg camber on the rear it was slightly pokey, and flush with 2 deg camber on the front.
Decided to go with,
F - 9 +35
R - 9.5 +38
RPF1s on their way from japan, hope this helps anyone looking to go big.