You keep talking about the T70/T34 as one item, but they are completely separate issues.
Five Core Concerns:
(1) T34 racecar speed + crush
The T34 isn't
that fast (unless ram is activated)? And if it gets fausted, it is almost certainly dead. I honestly haven't seen t34 crush being an issue. If they do manage get your squad in a group against a building or something, you can always retreat.
The T34 really isn't that great with its crush.
The T70 on the other hand is very fast and shouldn't have crush.
(3) Maingun melts infantry
Really? Its alright, but is far inferior to the t70 main gun. I would take a P4 with the MG gunner over it. It is definitely not a Ostwind by any measure.
The T34 is basically an Ostwind in Tank form.
Isn't an Ostwind already an Ostwind in Tank form?
(4) RAM
I don't have a problem with Ram, but I'm not opposed to a change. I don't think it should be a vet 1 ability though, since t34s don't really get vet late game. If anything was going to be changed, it should be made less extreme (somehow), not a vet ability.
(5) T34 vs P4
This fight is far too one sided. The t34 doesn't need to do well vs the p4, but it shouldn't just get pummelled.
"And take 2-3 shots from an Elephant to kill?"
Since when is asking for a medium tank to not get 1 shotted asking for a lot?
The changes I'd like to see, is make the t70 cheaper (like 40-45 fuel), reduce its rate of fire by 1.5-2 times and take away crush. Maybe reduce its accuracy too.
Then make the t34 more durable with either more health/armour and increase it pentration slightly. Potentially increase cost too.
EDIT: Point of these changes would be to differentiate the t34 and t70 even further.
Off topic: I'd also like to see a supply yard kind of building that would allow the t3/t4 building to be cheaper while not making any of the vehicles come out faster.