Look at the panther. It wasn't full HP. The AVRE and Sturmtiger both deal the same damage. I dont understand why you are trying to prove otherwise.
Also, the AVRE only has 50% chance to pen the panthers front armor.
Anyways, IMO both the sturmtiger and AVRE are OP.
The AVRE just could use a range decrease to 30. Infantry sight range is 35, meaning you have slightly more time to reposition your stuff.
The sturmtiger should get a range decreas to 35 or 40. Alternatively remove the ability to shoot trough buildings.
but buddy avre costs less and have more armor and hp does need to reload like sturmtiger that is immoblized and gets abandoned on being hit....sturmtiger doesn't have 360 rotation and Veterancy Levels:
Rank 1 – Crew experience allows for faster reloading of the powerful Petard mortar.
Rank 2 – Veteran crews can maneuver the vehicle more quickly and aim the turret faster.
Rank 3 – The Petard mortar is fitted with an even higher yield of explosives and creates a firestorm when it explodes. Additionally, the crew will repair engine-related criticals on their own after a short time.
and even after that sturmtiger is getting aoe reduced in next patch to same as avre....although i agree that both the units should get their range decrease and maybe a total redesign if neceesary