Using the formula quoted on Jegs (weight in lbs x trap speed divided by 1000) yields a 2 digit number, your max trap would yield 257 odd. The chutes are rated and you pick one with the appropriate rating.
I know you quoted some spec on your callipers but not much info on the brake system itself. Personally I use TBM brakes (The Brakeman) I use the Tornado F3 and F1 callipers which are also 4 pot and 2 pot. The rotors are the Revolution 11.75" x 0.5". These were more than man enough to stop me (3256 lbs) at nearly 160 mph, even though I have a chute I have only ever pulled it once to learn what to expect should I ever need to pull it.
André