160*0.46/6/960=0.0128
55*0.31/3.3/640=0.008
I think I might have put that formula better...
960/160/0.46*6=78
640/55/0.31*3.3=124
I got that it takes over a full minute of shooting for a PZIV to kill a KV-8, consistent with my experience and that KV-8 is about half as good at killing PzIV as vice versa, not really a good idea for a KV-8 to go toe to toe but it can survive and soften up a PZIV until a SU-85 arrives.
Please correct my math if it's wrong, but from that I'd say the armor is an issue too. In beta I remember blowing up KV-8s like nothing (maybe it was rng luck?) so their flame DPS wasn't much of an issue if it was a trade of 1 gren squad before KV-8 got intercepted and blown up, but now I can't kill the damn things.
Is this calculation done for attacking frontal armour? If it is then you're doing it wrong. KV-8 is a heavy tank with a survivalibity of a heavy tank. Always flank it.