I would like to see the E8 moved to CP8 requirement and get the normal sherman ability to switch from HE to AP so it becomes a direct upgrade to the Sherman and so it can take advantage of the HVSS suspension. AP rounds works as they currently are and HE will work as similar to a Pz4's normal round without the pen or normal Sherman HE (whichever is worse) but with the bonus of the special HVSS suspension.
For anyone that doesn't know. The E8 is the only tank in the game to have no scatter on the move. Taken from Cruzz's The more you know.
Easy Eight has no scatter penalty on the move so it will be just as effective against infantry with the main gun standing still as moving
Unfortunately the main gun on the E8 has been nerfed to oblivion against infantry. Its current role is more of a hybrid-tank that has many MGs to take on infantry while the main gun is reserved for tanks. The role isn't very defined which is something I would like to change.
With this change, I can see Rifle company commander making a come back with this stronger tank. It would definitely be the strongest anti-infantry tank out especially when compared to other specialized AI tanks such as the Centaur/Flak Panzer/Brumbar/105mm Sherman/M8A1. However I believe the increased cost and doctrine slot makes up for it. Its not very different from higher cost Axis heavies (high cost, good armour, good AI but slow speed).
I can see Rifle Commander being dominating early game if they control both fuel points as the HVSS suspension would make it very good vs anti-tank guns especially moving around them. Locking it behind CP8 (around the time meds come out) balances this somewhat. In team games, CP8 I would say is mid-late game around the 15 minute mark which is near when Pz4 shows up and a bit later would be when Panthers start showing up reducing the E8's window of opportunity for dominance.
If E8 is still too strong when massed, for the next step I suggest limiting the E8 to having only 2 similar to heavy tank limit of 1 and/or no crew dismount like Pershing so it requires RE to repair.