In regard to Infernal Axe/Lightning hammer. There are 2 routes they can go. Foremost I think they should retain UNLIMITED uses as is the trait for melee weapons.

1st route, I would fix both weapon such that they do more actual heat/electric damage dealt is higher but lower the resource damage of of both weapons. Some thing like 75-85 elemental damage and 15-25 heat/energy damage. They should retain their no knock-back effect. This gives the lightning hammer the potential to do 100+ damage and enough heat for the axe to have a decent return. (It requires no energy so the heat difference should not be too large)

The 2nd route is an essentially a SIDE-GRADE. (DEVS UNDERSTAND THIS TERM!) from Meltdown/Spark doing more damage but minimal resource damage. 70-80 Damage and 30-40 Resource damage.

The Physical hammer did not need a nerf btw. It should simply function different from the Meteor. I would decrease the damage it does and increase the resistance drain or vice versa. Meteor can be modeled as the balance between damage and resistance drain.