Maybe we should give KT AP-shells and HE-shells, like a sherman.
Sherman AP shell have decent AI, you are probably referring to ISU-152 shells.
... The obviuos decision is to increase front armor. So TD couldn't pen it as easy as it is. ...
Actually KT is the only Axis stock tank with high armor.
Increase the armor of KT is not the obvious decision, decreasing the penetration of allied TD is.