Rod..
Why do you need 19" wheels? why cant you get an 18 or 17witha taller sidewall? surely for this event you could do with every bit of traction help you can get?

Also have you requested the newer softer compound tyres (asuming its R888's as it a road legal shootout etc).

I'm sure you already know this anyway but make sure you do a couple of 100+mph runs up and down the track first as the tyres get massively more grip when heated that way instead of a burnout.

Good luck

Lee