I don't think that's right, Wotan. Your bomb will always take the same amount of time to fall 750 ft, but the faster your release speed, the further the bomb will travel horizontally before impact.
Imagine dropping your bomb from a hovering helicopter at 750 ft, then from a FW190 travelling at 300 mph, but also at 750 ft. The first bomb has 0 horizontal velocity at release, the 2nd will be travelling quite a ways before impact.