What you are trying to prove is wrong imo.
1. Allied are 3 factions against 2 axis factions.
Across all 3 allied factions, there are 2 stock tanks able to bounce ATG shots and its on the same faction and you can't get them both at the same time.
OKW alone has 3 vehicles able to deflect ATGs.
2. Even if there are those tiny differences between medium tanks they mean very little.
If you weren't completely oblivious and ignorant of the stats, you would be able to realize how extremely stupid and untrue that statement is - differences are extremely large here.
To sum up, allies have better armour, as it is cheaper and can reliably deal with both tanks and infantry and can be backed up by much better tank destroyers. Making raks less durable just makes no sense imo, as allied tanks are simply better than axis tanks (and very often even more amoured). How can one want to nerf rak if Soviets have dual purpose, even more durable ZiS guns?
That's another big fat cow cake.
Source:
https://coh2db.com/stats/
It doesn't even take an argument to disprove every single word you write, you literally are arguing against reality.