a little anecdote about the KT from few days ago. Brand new KT rolls on the front. It's not unsupported. It's got PAK43 behind it and infantry all around. Rifleblob approaches, obviously reveals it. 2 Firefly shots and double tulips from the FOW frontally destroy it in less than 3 seconds. And that was about it from my ultimate area denial/all possible fuel invested of a Hi-end unit. In all transparency KT was about 95% Healthwise since it got scratched by and AT when tryin' to scare of Maxim that prevented my infantry to move ahead.
p.s. It was pretty safely reversed after that first AT shot. But I was all invested to try to stop the rifleblob with my (all vetted) Sturmoficier, 2 volks, G43 Fusiliers AND Obers, which also failed, but that's another story I guess..
This pretty much sums up the arguments about the KT. If you see heavy TD investment, then don't build slow, expensive tanks! I cannot stress this enough. The issue you are having problems with is not related to the KT, but OKW in general.
The KT is the only non-doc super heavy in a faction, it is available when your opponent has lost the fuel war, is late in the game, and your opponent is still fielding tons of infantry which your JPIV's are incapable of providing any damage to them. It gives OKW a way to break through stalemates in which more lightly armored tanks simply cannot venture. If the game is close and there is lots of AT floating around, invest in other units. You have the buildings, get stuka's. Or if you don't like that get and infared HT and avoid the TD's. If you are using breakthrough I would recommend the JagdTiger. It has great damage against tanks, good damage to infantry, and its vet 1 barrage is deadly to anything. Its cost is equivalent anyway.
The Brit late game and the OKW limited combined arms is are problems right now, not the KT.