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I've looked at 3 different GTP setups not counting the GTP/L which was pretty nice
Most likely what you have is the Kit w/ F40 front calipers, and Lotus rear calipers on 993tt 322mm rotors f/r w/ a 930 m/c
I have feedback from multiple owners, all of it along the lines of what the OP has reported, some have led to serious accidents
torque bias for the F40/Lotus GTP kit is very much front 2.03, for referencea ll 911 before Porsche started messing w/ bias in '84 were 1.491
You should never use a p/v on the front
and w/ your current setup be sure to remove the stock one on the rear circuit
there are 2 things that you can do to alleviate the issue
1) lower the front bias w/ a caliper w/ smaller pistons, a 993RS/tt front(aka Big Red) bolts on w/the correct adapter and lowers torque bias to 1.856
2) raise rear bias, a 993 rear caliper can be adapted w/ a little work, a 965 rear can be adapted w/ a little less work, either of these will lower the bias w/ 993RS/tt front to 1.520. A 993RS rear can also be adapted and is far more difficult to do but that will lower the bias to 1.426
I don't understand why RaceTech sold that kit, the previous version was Big Red(993tt/RS) all around and was fantastic as long as you got the 993RS rear calipers, form what I understand some came w/ 993 tt rears which would be as bad as the GTP kit
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