To further prove my point, I will now use an OT hammer and get a crit. It also has a 50 delay (like the BFG) and is a 2hander. If the difference between the crit and damage is exactly 42 (same as BFG) will you accept that crits are behaving correctly and are aligned perfectly with the 2h bonus table?
Here's the bonus damage table for 2handers:
https://lucy.allakhazam.com/dmgbonus.html?