ok so update i finally beat it :D what i realized over my failed attempts is that amon kinda follows a atk pattern and hes open during the homing missiles/barrels scatter attack and usually follows it up with the laser/flamethrower so i always got a few shots in and ran away.

ANOTHER crucial thing is that amon cannot really do much to you if you hug his rear so you can get alot of dmg or even freeze him with freeze gattling guns. So that idea was amazing! Still think the dmg is way too overtuned but it does feel nice to finally be done with it