Not as much irrelevant as your participation on this topic but close by.
Being countered by two TDs or two ATG isn't the problem here, the M4A3 is also countered by those, but the M4A3 brings something on the table for the USF, the EZ8 brings nothing.
E8 ensures the enemy can't rely on p4s to bully usf where otherwise they could and would. It's one of the only USF tanks that can bounce anything at all
That said it is kinda boring...
If it's changed I'd maybe see it as a command tank. Make the crew elite (as in with the usf elite crew upgrade pre installed) come pre upgraded with the mg and give it a few abilities. Limit to 1. Then you have sort of the opposite of the p4 command tank-instead of being helpless against enemy armour but good against infantry, the inverse but it's most important role would be as a force multiplier.
Give it all the shells!
But as single shot abilities with a cool down.
Give it perhaps the ability to to give nearby tank MGs suppression and increased modifiers (timed ability)
Make it a FUN unit that a good player can get a lot out of.
Make it a cross between a tiger ace campaign and the movie fury.