The biggest thing wrt the tires accel/decel performance is the tire OD
here's a comparison of the difference between comparable 15 and 16s, the 16s lose ~38lb-ft of torque just to spin them up compared to the 15s, the a6s are heavier but the vast majority of the difference is due to tire OD
I agree RE71s are a great tire choice i have a set and they compare well w/ DoT Rs