I mainly play Teamgames, but here's my 2 cents:
I think it could warrant another mobility buff, mainly to acceleration and rotation.
That would cement it as an alternate tank destroyer for the soviets; a nimble speedster.
Maybe also reduce its barrage cooldown to 10 seconds after barrage finishes. That would allow it to fulfill the Multirole tag line a bit better. (as long as you feed it Munitions)
This way depending on your playstyle you get to choose:
Do you want Recon+ a rugged pile of DPS and HP? SU85
Do you want speed and mobility, and Muni barrages? Su76.
Do you want a heavy-TD multirole? ISU152
Like how Axis players can choose between
Tank Destroyers (stug/miniJag),
Panthers,
heavy TD (elephant/BigJag),
soviet players would also have 3 choices for anti-tank playstyle.
Yeah I've also come around to the idea of making it more agile as opposed to increasing its AT.