OK, a different approach. Can't be bothered pasting graphs for all, this is just torps.

It is a hybrid equation of the original and my most recent modification...basically I've replaced the "minimum" part of my equation with the old damage equation as follows;

=MIN(MAX(((EXP(-1*(((TS*(MAX(MR/TR,1))^2)-EV)/1500)))*W),W*MIN(TR/MR,1)*EXP(-1*(MAX(TS-EV)^2)/(1500^2))),W)

TS = Target Speed
MR = Missile Explosion Radius
TR = Target Radius
EV = Missile Explosion Velocity
W = Warhead Strength

OK, now THAT is complicated, but it looks like this;