If churchill is fine as it is, then we should agree to limit this tank as one per player at a time. Of course same thing for the KT - this is a problem that wasn't solved yet.
For instance, I don't think there is comparison between a Tiger and Churchill in terms of durability, and that is kinda screwed up both reality and balance wise. You simply cannot adventure into enemy lines with a regular Tiger and not fear to lose it while you can do this with a churchill with almost no problemo.
I think the problem is related to heavies in general and not to particular call-in units. The spam of units that are good at all, can take alot of punishement while inflicting a ton of damage should be forbidden.
i'm really not against a price tweak or a limit of 1 churhill, although i'm not certain a limit is necessary. i do find in general play that i generally don't want more then two churchills (and 2 is only if the enemy has a LOT of AT, like 3 jpIVs) because they don't do much damage and they eat up pop. i think the grenade should probably have the falloff normalized and then see how it is from there. if it still has issues then increase the fuel cost by 10 and look at it again. it is pretty cheap right now, fuel wise, but i also think that has a LOT to do with how little damage the tank does and people just notice how much of their damage it takes to kill it, especially since the only comparable allied vehicle is the IS-2 and a lot of people still have problems dealing with it.
If the churchill is pretty much fine for only 150 fuel ,let's give KV1 more HP,imo 1400 is pretty fine for KV1.The HP is the only way to make KV1 durable against axis late game,just like the Churchill.
And also pls give brumbar some love,it cost 160 fuel,it's 10 more fuel cost than the Churchill,not to mention that high tech cost of T4.Yes the brumbar really need 1600HP. They need that high helthpool to make it more durable against allies TD.Just like the churchill.
i do think the KV 1 could use a buff to make it more interesting, i don't think it should have 1400. i think giving the kvs another 160 hp (960) would give them good differentiation from the other soviet vehicles, particularly the 34/85.
i'm of mixed opinions about the brummbar as its issue is not that it's a bad tank but that it's expensive and the late game is about AT. i'm not sure the brummbar would be particularly helped by having more health as it would just take even longer to repair, which is already one of the biggest weakness of the brummbar (slow speed and a long repair time means it spends a lot of time not shooting). maybe a 10 fuel decrease on the brummbar to make it more affordable late game.