There are quite a few possibilities here, although I agree that it was probably a recipe of many things.
How many miles are on the car now, compared to when you went to VIR? If you have some older brake fluid, that will contribute to soggy pedal feel.
Two things I would suggest:
Bleed and put in a higher temp brake fluid (Super Blue, Motul, etc) as this will refresh the fluid and take out any air bubble you may have.
I would also consider a set of track pads for your next outing. This will really improve your experience and safety on the track.
While on track at Mid Ohio, I watched a car lose its brakes right in front of me going down the back stretch to China Beach and took out a 2 week old Boss 302 Mustang. He was using OEM brake bluid and brakes.
Don't want to scare you, just something to think about.
Last edited by TC Kline Racing; 07-18-2012 at 12:23 PM.