Since you have a Coupe you can run a bit wider rim in the rear. I'm using a 19 inch by 11 wide rim with 50 mm offset and 345 30 19 Nitto drag radials [on a Coupe only]. With 603 RWHP I run 11.09 @125 with 1.65 60 foot times. I do think the special for Caddy, Weld 17 inch by 11 inch rims with 325 45 M&H drag radials are the real answer though. Should be good for 1.5 60 foot times and allow a long foot print at lower pressures due to the taller sidewall.