The T-80U are vastly superior to any tank NATO can field (I've had a squad of 2 t80u tear down a squad of 4 leopard 2a4).
That's just really bad luck or poor micro from the Leo player. If those Leos had split up they'd have owned you unless they got very unlucky.
Yup. Or the Leo's were damaged, or they gave side armour hits, or they had morale damage. All sorts of stuff can turn this in favour of the T-80Us, but in a straight head-to-head fight the T-80Us don't stand a chance.
Maybe some magical side-shot crit situation with well seperated T-80Us and the Leos in a 4 group, and the non-targeted 80U being one accurate, lucky mofo.
But yea, 320 points =/= 590.