Half the reason,more 40 HP means can suffer one more shot by AT or normal panzer cannon,but 40HP also can be kill by PTRS when pierce or kill by bazooka or PIAT 2 shot not pierce
Some ideas for IRstg44 and IRHT
1. bundle together,and IRHT have more longer sight,Build IRHT in T0,need deploy any HQ
but add 251 or 250 HT to medicHQ replace it
2.IRstg44 rework be a call-in unit like assault Tommy in test mod,maybe can give some different ability make them more special
like
3men squad with 25% damage reduction and default weapon is 3xIRstg no slot,and camouflage