Really don't need acceleration to bomb well or memorized speed's either.
Take the time to setup a good approach. Give yourself 10 miles to let your speed settle.
Do a good 10 - 14 second calibration. Pull up the E6b, and use RPM to make actual speed the same as calibrated. If you did everything right usually 2 or 3 taps of the - key will have you balanced out.
Then zoom in and drop your chosen targets.