The reason I never brought up a StuG-E idea, is that it'd likely be more oppressive because of 24/7 HE shells that are incoming by the 6-8 minute mark and even if its AT was lowered, it'd still be enough to tackle light vehicles in that time frame. Sure you can have shell swaps, but unless the HE shells are range 40, which then you get a function that is very meh on a fragile unit, I don't believe it'd be good for the game.
And talks about SU-76 barrages being better, well that is easily addressed with cooldown recharge was decreased. Its damage could just not be affected by veterancy 2 and the extra 2 shells could be removed.
I will restate my priority on changes:
1 - Barrage Recharge
The barrage already gets lots of buffs with veterancy including a -25% recharge why mess with it?
Simply make the barrage a vet 1 ability so that it can no be spammed from start and remove cost.
or
Have each vet level reduce cost and CD
2 - Rotation Rate
Again the unit get a high rotation bonus of +25% and is probably one of the fasted rotating vehicles why increase the base stat?
Simply spread the bonus across vet levels if you have to
3 - Speed
Why turn the unit in kiter?
Only 1-2 needs to be implemented max before others things need to be addressed like its strange veterancy 1 which as I mentioned in the video doesn't suit it. It doesn't need to self-sight for a vehicle that generally doesn't chase and operates at the back of the line. A better veterancy ability to suit the unit would be ideal even if it's just adjustments to the barrage over the course of the game.
Why not create more room for the unit by making the SU-85 less cost efficient vs mediums?