Why not try the staggered setup they use on the Boss? From what I've read it's one outstanding track car, even with the fatter rears.
Unless OP copies all or at least most of the rest of the Boss's mechanical goodies, including engine output, axle gearing, springs/shocks/struts/sta-bars, bushings, etc., he'll understeer more than the Boss, and more than his car does with same size tires.
I'm not saying that decent handling can't be had from a staggered setup, but in order to do so you're crutching a second-rate tire situation with a less stable suspension arrangement and hoping that they balance each other out over the range of your driving. Trying to balance one effect that's trying to understeer harder as the lateral g's build with oversteerish chassis tuning is fighting with yourself. Not harmonious. Potentially tricky, think snap-oversteer or what the circle track guys call "tight-loose".
Really, for 400-ish HP and down in a 54% front-heavy car, start with same-size tires all around and tune the suspension around that. North of 500 HP and a little stagger starts to make sense. 444 HP should not need 30 mm worth of tire stagger unless you're specifically trying to protect people who have no business driving such a car at all, way up there anywhere near its limits.
Norm