I added the WRX Stoptech kit to the calculations. I do not recommend this kit as you will drastically shift bias to the rear...
I have not changed the stock rear bias calc yet. This is for two reasons. One, all the manuals I have read show a 38.1 mm piston, not 32 mm. If it is 32 mm, the bias on this car is more front oriented than any production car I have been able to track down.
That leads me to the conclusion that either both front and rear piston sizes are off, or the two rear calipers that were measured were wrong...
Anyway, I will update if we find out more...