I subscribe to the belief that CoH2 should take inspiration from how things work in real life, and use this to influence balance, but not dictate it outright. It also should not totally contrast real life. Or maybe you'd like Lee Enfields to penetrate a Tiger; reductio ad absurdium etc. This is the problem I see with IS2 having a ton of range.
Anyhow if you re-read my final PG it does pertain to balance and offers my suggestion for both King and IS2.
Sorry, but too much of the game is very different than real life, and it would be extremely difficult to rebalance at this point. For example:
The Pack howie, M8 Scott, and SU-76 had operational firing ranges that were about 70-80& of a LEFH. Would you really want their barrage to have 120 range? Their shells only hit about 1/4 as hard so either their damage would go down or the LEFH would go up. Then would would you do to the ML20?
Open top TD's like the M10 and M36 were highly vulnerable to infantry small arms, grenades, and mortars. Would you want to have to return to base every time a mortar hit your M36 and pick up a new captain, gunner, and loader? I bet the real-life M10 never crushed a single Wehr soldier.
Hull-down was used for tanks only, and wouldn't have increased range, it would have simply decreased target size and anything mounted in the hull wouldn't be able to shoot. It basically turned a tank into a pillbox.
The game is fun as-is. If you want something that is more like a simulation then try Steel Division, which is a lot more accurate but not as much fun.
I haven't tried the new KT yet so don't really have an opinion. I watched replays of a couple of games that I was in where people were complaining about 2-hit wipes by KT's. Nothing really seemed that bad when I watched the replays. Other vehicles like the ISU are also pretty good at getting 2-hit wipes.