WRC n FormulaD

So I currently run 255 front, 265 rear ventus RS-3s on 18 inch wheels for track, autocross, daily, etc. I'm planning on doing a few drift events this year and have a set of 17x7.5 winter wheels (I can dismount the winter tires).

Basically, would it be crazy of me to run a 225 tire (federal 595s, achilles art sport, something like that) in the rear w/ the more sticky 255 tires in the front? Would this be too much of a difference in front to rear grip? Btw the car should have about 340+ horsepower at the crank, hopefully ~300+ rwhp.

Thanks in advance