Re: Widest front tire?
Nancy has run 335/30's (on John Purner wheels) with not much problem - tends to hit the porsche deflectors on hard 'crank' of the wheel.
Nearly everyone at Viperdays runs 285's on front (not even sure Bobby Archer brings 275's to track anymore).
Not sure about your brake system - have you removed the 'impediment' to full pressure on rear brakes?
Best cure is 'SnakeBrakes' (ABS) from Archer. Worked/s great for us.
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