Ostwind is more expensive than a T-34 (80mp, 20 fuel difference, IIRC?, which also means in an even fuel game there's going to be a window where the Russian player can have 2 T-34s to just the one Ostwind). It loses to one T-34 in an even fight (a vet 2 Ostwind can maul a T-34, though) most of the time (in a long distance frontal engagement the Ostwind will usually be able to retreat to somewhere it can get support).
Not really sure it trumps T-3 at the moment.
I don't think it would be a viable first choice if a T-34 which also has AI capability and is cheaper hard countered it and a T-70 had a fighting chance (and I like having all of the Ostheer T3 as a possible first choice). I've yet to see aircraft as a huge deal as Germans, tbh.
Yeah, maybe the T-34 needs some kind of buff (probably penetration or weapon damage) but I think buffing the armour to the point where an Ostwind doesn't penetrate is overkill, and making it a P-IV pretty much kills the asymmetrical balance which is the best thing about CoH really.
T-34/76 lose to very thing and T-34/85 stands no chance against PZIV(which is cheaper) is not a asymmetrical balance, it's called cost-ineffective or waste of resources or ....underpowered