So I thinks stugs and JP4 should have their long ranges pens increased to 290 to facilitate your ideal vision for the game. See as comets/churches are "Immune" to their counters.
Double StuG (about the same cost as a Panther) butchers Churchills.
Comets do not do well against Panthers.
My opinion on the 230 FU heavies is pretty well known, but I think nondoc heavies (Panther and the UKF ones) are all balanced really nicely.
I'd have no problem if the Tiger, Pershing, and IS-2 were rebalanced to be like the Comet.