One sortie I'm getting 1 shot kills, the next, 4 rounds do nothing.
This is one thing I see people talking about a lot ingame that seems to me like a basic understanding issue.
My understanding of tanks, and please do correct me if I'm wrong, is damage is completely based on the angle it hits your armor at. If the angle is steep enough, it penetrates and does damage. If it does not penetrate, it does 0 damage. Not some percentage of damage if it doesn't penetrate, 0. So if it does not penetrate, you can sit there and bounce 100 rounds off that same location at that same angle or shallower and it will never kill the tank.
This seems to me to be a huge misconception among GVers.
As far as tank perks, meh. Does it really matter if it's the current mostly T34s or mostly T2s?
Wiley.