I've been one of the largest proponents of the TD/A-augmented Medium rush strat, but I know it won't work at the very highest levels of PoC that people are getting to these days. So...in order to open up that possibility in the future, I think I need to start working on some Heavy tanks. I have a few from which to choose, so I'm looking for some advice on which ones I should work on.

My 5* choices are:

Cerys, FV214 Conqueror
Amelie, ARL44
Alyona, IS-3
Nira, T30
Vitaliya, IS-7
Ulyana, Object 279 (+20% XP boost)

And then I suppose I need to learn how to best employ them.