I only noticed when recently checked my stats on one of those websites and it wasn't a conscious decision, but I basically stopped playing heavy tanks.
With the way meta is, playing something slow that gets spammed with gold and 'artilleried' to death just isn't my cup of tea. Between that and having plenty of heavy hybrid mediums like Object 430U and ridge line warriors like Centurion line, I just don't see the point.
Literally only heavy I've been playing is the King Tiger (C), which actually isn't a bad tank. Just do the daily 3 games for the Twitch missions and it is also a very decent credit maker, which is vital for someone who's played 99% of his time on a F2P account. You can barely afford to run T9 tanks and lot of T10 tanks will lose you money, bad team streaks can wipe your silver balance out.
The Tiger II chassis works much better as a heavy at T7, just like Tiger I works better as a heavy in its T6 forms. Did though get a rental of T26E5 for 14 days with Twitch which I have been enjoying, but definitely not enough to drop £25 on it. Apparently though you'll be able to buy it soon with bonds, according to some rumours anyway.
Still finding Chi-Ri an absolute agony, if that tank was least the size of its T5 and 6 counterparts, maybe it would work better. Also have very little enthusiasm to play the Panther II, it just feels very lacklustre. Baby Panther was amazing, Panther I was a little toothless but made it work and this I just can't bring myself to play. Probably not helping that I don't think I'll be getting the E 50 so don't see the point of playing something I don't enjoy.