Good to see Bolt Thrower and Kreator getting a mention, who I just LOVE. To be honest, those bands don't even strike my ear as "heavy" after so long listening to them, even though they are.
I would also put Carcass and Rotting Christ out there as two of my heavier/favourite rotations (hopefully seeing Carcass supporting Behemoth in October if Covid takes a hike??)
Side note to add: live, breath, eat, sleep, die for Megadeth. I have devoted my life to that band.