Secondly I'd like to see the is-2s vet 1 looked at. Make it something fitting if the tank (tank shock perhaps?) so that it feels rewarding vetting it up. Something so expensive shouldn't have to wait until vet 2 to start benifiting from a core mechanic like vet.
3rd if like to see the gun reworked to be more unique. I know this isn't by any means pressing but I'd personally like to see more diversity in the way heavy tanks feel and operate.
I'd like to see its damage go up and it's ROF fall as well as an AOE rework that keeps its lethality the same but it's damaging area wider. This makes it more support in a uniquely Soviet way which can help make up for lack luster cons and shocks making it a whck that weakens an area instead of a pop that punches a hole all by itself.
Miragefla in his mod gave the IS-2 an HE shot for Vet 1: huge AoE, stuns vehicles hit.
Reworking the gun for flavor is something that I would like. Previously I proposed increasing damage from 160 to 240 but also increasing reload from 6.2/6.6 to 9.3/9.9. Effective DPM unchanged (making performance against other tanks the same), but the gun is more unique and more effective against infantry and Axis bunkers.