Same here, not too sure now as i havn't found a proper set of rims for GTR, i'm running 17/8,5 and 17/9,5 so car handle a bit wierd for a 32Gtr also my Tein is wearing out a bit as well.
yeah i think i know what you mean by a half launch but i think my heavy duty clutch won't hold it as well as your twin plates therefor it will BOG down.