Interesting it's intended that some tier 1/2 MBT's now have more side armor than tier 10.
There is also a power drop between tier 6 & 7 tanks now, generally only getting better now at tier 8 or 9+. The British tanks are a great example of this - the HESH at tier 1-6 actually has reasonable pen and damage given all of the armor changes*, however at tier 7, it then becomes weaker and at tier 9 it's worse than the AP shell.
*Now crew killing becomes a must in some situations - tier 3 pvp when the enemy MBT has 3k+ HP and your shots are doing 300-400 (if they pen) is just stupid as you'd need approx 80s to kill a full HP tank if every shot penned (if your tank has an 8s reload). The alternative is to drive a tier 2, which has 9k DPM and a sub 3s reload and just rip everything to shreds.
*Afterthought* Still not explained why ammo swap has been added across all types of tanks on tier 1-6, where as tier 7+ it's limited. A case of clearly Devs not knowing what changes they are making to the game?
Also ADGS appears that it might have had it's armor changed as now it's gun mantlet is between 7-800mm thick?