Wotan - a slower speed means a smaller turn radius on the run in so corrections to directions can be made earlier and the plane will settle back to level flight quicker.
Also slower speed means errors on the trigger pull relate to smaller errors on the ground.
Also the true airspeed was quite high anyway as even 150 mph indicated at 23,000 ft is well over 200 true and even at that speed the spread is only half field length - start bombing from 15k and true airspeed is lower - at max power level you wouldn't be able to string 7 eggs acros a field.
It can't be THAT hard to change the program
Sparks