Worst mission ever, or am I just bad?

I'm three missions away from the Obj 279(e), and Coalition 14 is just kicking my ass. I have to be top on damage (battle, not team) three times in five games, and I've been at it for fucking weeks.

In my latest attempt, the two games I got the mission done where both 6500+ damage Ace Tankers, but that's not enough, because I have to do it three times, and I keep getting screwed over.

First of all, it's SUPER hard being top on damage in a losing game. I've done it before, even while on this mission, but it's rare. Secondly it's really hard to consistently be top, because if I play high damage auto loaders like the AMX 50 B I get screwed in steam rolls, or in annoying heavy maps because the 50B isn't an armored heavy.

I tried the Swedish, but they get screwed over by many maps as well. I tried Italians, but they get screwed in the many steam roll games because they're too slow to deal their damage. I tried the TVP but they don't stand a chance in losing games of doing the mission.

The best success I've had is with the AMX M4 51. It can fight tier 10s, it can bully lower tiers, and it's not screwed in any maps, but the steam rolls are still just kicking me in the teeth. I've had five attempts now where I got 2/5 (and a LOT of attempts with just 1/5), but something just comes along EVERY damn time and ruins it.

On top me having a good game, there are 29 people that cannot be having a good game, three games out of five.

Which tank did you do it with, and were you just persistent until lucky, or am I missing a tactic for completing it?

Edit: Completely forgot to rage about the two attempts where I was all set to complete it, and the got the attention of three artilleries. Congratulations to me, I can either hide here and win, but not do my mission, or I can drive out, try, fail, and cost my team the win as well.