I fail to see why the Bofors on the 40mm are anymore or less effective, infact... unless the muzle velocity on the JU is a factor, I would think that the 40mm's superior mass would have a a greater impact.
Look there is a reason everyone and thier brother got out of the 37mm anti tank gun buisness in ww2, they are duds unless you get gits in a soft spot, i.e. the turret top, engine top, or rear.
I think its going to be the same old game of trying to thread a needle from 1000ft, just a game of luck and skill.