1. It just needs to have the RoF bonus removed, the reason cons needed it more than grens is because grens are just fine now with damage reduction making them actually last into the late game, it also fits the soviets thematically more anyway.
2. Sure, give it more consistent penetration too.
3. Make it come at the same time as those two.
4. Give PTRS the same AT capabilities of panzerschreks since that's your argument. I wouldn't even mind the price increase at that point, also, stop letting AT penals get within licking distance of your tanks.
5. Tough luck, also dunno how you're failing to keep up with the IS-2, but it could use a bit of toning down. It's arguably the main culprit for making soviets OP
6. Sure, give it the RoF of other ATGs, then as it's tied for the most expensive AT gun and has the worst starting DPM, is stuck in a mediocre tech tier with a negligible mortar and an okay Maxim.
7- Kill the soul of the faction, why don't you? I'm not even going to grace that with a sensible retort.
8. some TD reworks are needed, but the SU-85 is fine as the top dog as it's what carries the soviet lategame.
9. Sure, I wouldn't mind buffing all the soviet tanks by giving them new and better abilities