GS300-2002

Is there any way to change the brake bias on a stock setup?
I know it was not made to be changed but perhaps something can be adjusted?

The reason I ask is that I autocross and not only do i want to dial more braking force towards the rear to affect the balance on turn in but also it would give me more braking power. After each run i spray the brakes down to help them cool off in between laps and the front brakes instantly boil all the water that i spray on them while the backs are as cool as a cucumber.

Also aftermarket brakes are out of the question, installing any brake upgrades would move me up a class and I dont have the $ for that

Thanks