2. Slot 4: 7CP - High Explosive Anti-Tank Shells (HEAT) - as much as i love the ability i don't see it with a new Tiger tank "E". Sounds way way too strong and could also 2 shots any medium tank. It's not so scary for KT becouse it's a really slow heavy tank. Tiger with blitz and HEAT sound way to good.
The Tiger does only 160 damage, so HEAT shells (+30% = 208 damage) on their own don't really change anything to the standard medium match up.
Medium tanks still take 4 shots to kill (3x208 + 16). The only thing it does is that it works well in conjunction with other units, as the remaining 16 damage can be done by anything from deflection or explosive damage to Panzerfausts.
Though there are still advantages, as with HEAT it only takes two shots to kill lights (400HP) and four instead of five shots to kill the premium mediums (800HP).
So yeah probably still OP on the Tiger as it gets a really high ROF with good speed and range with vet.
It could still work if you simply disable HEAT for the Tiger and leave it for all the other vehicles.