The king tiger's durability is not the only thing that make it fearsome, it's the fact it's got the 88mm kwk 43 doom cannon.
Even if churchill have the same hp and armor as the king tiger, the king tiger is still going to be the stronger unit.
We are not even complaining about the churchill's gun, as those knowledgeable recognize the fact that the 75mm ROQF was a "ok" gun at best.
So, if armor is ok, gun is ok - what's wrong with Churchill then? That's question to OP, cos I don't understand his point about Chruchill at all.
Suggestion to give some "bonus to units around Churchill" is... kinda good but only in one case - it won't have main gun. Just like Cromwell Commander in vCoH.
Actually, I think it could be good to change Churchill in Anvil tactics to single Cromwell/Comet Command tank, which will perform like Command Panther (with some another bounses and abilites, though) and will be unarmed. And won't cost too much because of it, maybe 50-80 fuel. What do you think about it?