The tank CSAT T-100 Varsuk always withstands more weapons hits while this is not a heavy tank, while tanks of other factions will withstand less hits.
I have tested with Mobile Launcher - "AT-Titan Compact" This is the most powerful anti-tank weapon in the game. I always shoot in Top mode, In theory, such a mode of fire should guarantee one hit to completely destroy the tank.

If you shoot at the NATO tank, - M2A1-Slummer, then this tank can be destroyed with 1 missile, less often with 2 missiles.
The same situation with the tank of the Independent faction, the MBT-52 Kuma tank can be destroyed with 1 missile, less often with 2 missiles.
But if we are talking about the CSAT T-100 Varsuk tank, then 3 and more missiles are always required to completely destroy this tank.

I disabled every mod completely and I ran 5 tests in a row and this tank has always withstood more AT-hits. It looks like a distortion of the balance and also this feature is turns into a real problem, if the Arma3 user uses mods, that increase the endurance of all tanks. As a result, the player cannot destroy the T-100 Varsuk even with 3-4-5 Titan-Missile hits in the Top fire mode!

Please balance the basic tanks of all factions equal, seems to me the M2A1-Slummer, MBT-52 Kuma, T-100 Varsuk should have the same durability and toughness,
while the T-140 Angara may have an extra durability and toughness, as it is a heavy tank.