my only guess to that point is just that...a guess.......
how far out are you hitting them? maybe some kind of an "arming distance" on the tank rounds? (there is in real life)
the other chance is maybe something to do with the hit boxes?...cause a direct hit from a tanks main would vaporize a body just from impact, let alone explosion
as for a mix of HE & AP....those are 2 seperate rounds loaded as called for....so maybe your crew has HE loaded, you shoot the 1st time & they figure it out & load AP for the 2nd?
