Thanks for Ogopogo from WotLabs.

AT 2:

Pretty major nerf. Cupola stays the same, but the big parts of frontal armor are way thinner.

AT 8

Basically all frontal weakspots removed. The weakest parts on it’s front are 152 mm thick.

AT 7

Similar treatment as the AT 8.

AT 15

Mantlet no longer has weakspot behind it (so it is more like on the AT 15A). UFP is now 139.7 mm. Cupolas are thicker as well.

Tortoise

Entire front became stronger. The roof is now 57.2 mm thick so it is no longer overmatchable except for the biggest guns in the game.