The doctrine is shit, because it doesn't work at base principle-it doesn't allow for increased armor production, it does exactly the opposite, it limits your field presence, therefore your resource income, therefore production.
And your fixes are utter bullshit as well, you're describing a gimped tiger/IS-2 here.
The KV2 with 320 armor and 1280 health would be a midground between the Tiger and IS-2 armor wise and have the KT's health. Also the ISU fix should be applied to the KV2 because super powerful anti-everything shells are retarded gameplay wise on long range units.
It's limited to one now, so it kinda need to be able to hold its weight against the enemy by itself.