FOX,No, I'm afraid that I don't, but I have experience with Toyo Proxes in various versions, and I am running them front and rear on the AWI Monobloc's. That is Proxes T1-Sport. Note: there are a few different versions, and they are absolutely not the same. These stick very well indeed, and they have similar build and threadpatern as the Pirelli's in 315. I've done all season now on this combo, and I am happy to say, that I find that it works well, for dry road, for rain, for steering, braking and for wear and also they seem similar in compound. That is my take on the matter.
I agree with Sanj, hence the rebuilding of the outer lip on the 18"x10" rears to a slightly wider outer lip, being 10,75" in total and the tires sits perfectly. The Sport300 ran a wider lip as well, being 10,5" wide in total on the rears and thereby supporting the 315 wide tires (though still 17" and a higher profile).