Yup you find the problem, soviet late game tanks are more expensive and only have moderate AT capabilities but good at AI, and that leads to a problem, cuz only suitable solution to the late game german tank spam is Su-85 not to mention it have been nerfed twice
It's not a wise choice whenever you pay more costy tank in the late game which is lacking AT capability to deal with less expensive tanks
I seriously don't understand what you are complaining about. You seem to want Soviet tanks to be AT focused like German tanks. This game is deigned to be asymmetrical. It would be boring as hell if both sides had the same units.
You should be building AT guns or SU85s against Tigers and Panthers. The role of T34s in this game is infantry support.
Ram already has over 50% chance of disabling a tiger from the front, which is pretty ridiculous.
I've never had a time when I felt I couldn't handle German tanks with Soviet T3 as it is.