I liked my KV and that 76mm was far batter for me than the big clunky derp gun they have for that. Stick with the smaller turret and the higher rof and you will have more fun.
I love how "low tier" my KV was... with a superb crew and a gun capable of killing just about any other tank on the board with a shot or three in the right places. And the poor lights/meds at those low tiers barely make a dent.
I found the Hezer tedious, so I sold it and abandoned the TD trees altogether. I might buy mine back if I get bored with the Russians.