FT=Vg x (sqrt 2H/g+H dot/g+Tau+Time Advance) + H Tan Lamda x Cos delta
Vg = Groundspeed
H = Height
H dot = rate of climb/descent
Tau = Bomb ballistics IIRC
Time Advance = 0.55 seconds IIRC to allow for firing train
Lamda = trail angle
delta = drift
There are your 7 terms I think
Bomb doors took 7 seconds and would be opened by the NBS pulse
Lock out was IIRC 10.55 seconds
In the 70s it was decided that bomb doors should be opened manually somewhat earlier in case of unknown battle damage or the failure of one of the hydraulic pipes. BEagle would be better to advise on that as it was after my time.
Finally, Strangeglove like, it would have been possible to set the NBS on BOMB around 140 miles out, set all the switches, and then bail out. The main problem would have been the speed for a rear crew bail out if cruising at 325 kts or the risk of the auto pilot dropping out when the pilots stepped out.