I too would like to see the t-34-85 as a universal upgrade to t-34's. Maybe 80 fuel and 200 mp or something within that range.
The T-34/76 can do almost as same as 98% DPS against a PZIV, there's no point to make it a Upgrade-able unit if it stats stay like this.
My suggestion is:
Make it single call-in Or for 1v1 competitive purpose,make it buildable in T3 or T4 factories after it gets unlock.
Reload reuce form 8.45 to 6
(no reason make it highest reloading time among the guns with 160 alpha damage)
Armor increase from 124 to 180(on par with PZIV)
Penetration rise from 110 to 140~150
(85mm zis-53 or D-5T should be better than the PZIV)
Cost from 720/260FUEL double call-in become 400/125FUEL single call-in or buildable in either T3 and T4.
Scatter increase from 2.6 to 9.5
To make it more AT like
Just in case if someone ask why the armor is slightly better for its hull only has 45mm armor, well it's 100~110mm turret front armor and hull is 45mm 60° sloped from vertical=45/cos60=90mm VS PZIV 80mm maxium)