ye 90% duty with 600hp worth of injector and making 376hp atw...doesn't add up.
I would expect that from standard 444cc injectors
are you 100% sure they are 600s?
Soarers/Supra's are teh suck on race tracks.
I haven't had a trackday fix in 2 and a half years (Soarer is auto)
Plus I know enough people that race them that when we put out heads together I'm sure we can make it live (for a little while anyway lol)