KV-2 has 300/180 armor with 1040 HP
Brumbar has 260/105 with 800 HP
Brummbär has low veterancy requirements and gets to vet 2 in no time. Then it has 340 armor while being non-doc costing 150 fuel and having better mobility than KV2 that costs 230 fuel and is tied to only 2 doctrines. KV2 in revamp mod is easy to kill because once it´s snared it´s so slow that it can´t get away from anything + it gets penned by Raks, Pak40s, Panthers, even Stugs and JP4s with high %. Meanwhile the only thing a vetted Brummbär has to fear is massed TDs, especially because Ostheer has a number of doctrines that have Panzer Tactician.
KV2 should be a better Brummbär with less mobility but better survivability and damage despite slower reload. The way it was changed in the revamp mod is alright, although I still think it´s either a bit too expensive or a bit too easy to kill. The damage in siege mode and regular tank mode is good enough vs infantry and also tanks.
In my opinion 1080 HP + 300 armor is not gonna cut it for a super slow, late game vehicle that is tied to 2 questionable doctrines. Maybe make the 0.8 recieved damage modifier a vet 2 thing. From testing the new KV2 it seemed a very long way to get it to vet 3. Plus it´s acceleration is slower than that of the KT, which is a bit shocking and unexplainable. Makes it hard to manoeuvre, turn, etc. KV2 has decent max speed but acceleration is more important to get out of bad situations while getting flanked, having to rotate to get frontal armor to enemy etc. That´s one of the good things about Churchills they have very good acceleration.
Here is KV2 speed in comparison to other tanks just to show what I mean:
KV2 4.9/1.3
Brummbär 5.7/1.9
Tiger 5.2/1.8
Kingtiger 3.8/1.4
KV1 5.1/1.6
IS2 5/1.7
Crocodile 3.8/3.5
Churchill 4/3.5