There is another problem with the veterancy of the T34-76, namely that it gets pretty much nothing for killing big targets. In this game I had a T34-76 that had 12 infantry kills, did a lot of damage to many tanks, killed a vet 1 Tiger I and killed a vet 3 Panther, both of which it did more damage to than just the last killing blow. It was just over 80% to veterancy 3 after even more engagements. This is beyond lackluster, especially when you consider it doesn't affect anything apart from movement speed and frequency of fire. Keeping this unit alive is a pain in the ass, even more so when it takes ages to actually get it to vet 3, which again doesn't do much.
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