Do please bear in mind that the "elements" - be they earth, air, fire and water or earth, air, fire, water and metal - stem from early alchemy wherein the practitioners sought to understand the make-up of the universe and opined that it was made up of these "elemental" things - basically solids, liquids, gases and heat (with solids divided into non-metallic and metallic in some systems).
The theory was everything was made up of combinations of these elements and that you could create what you wanted by mixing them properly.
All solids were "earth", all liquids were "water", all gases were "air" and you usually threw random earths, waters and airs together and heated them to see what would happen.
If you (or your assistant if you were a clear-thinking individual) survived the experiment, all the better.
If you were really lucky, you might work out something useful, like how to refine phosphorus from your piss and get to name an actual real element.
Adding things like "mind", "spirit", "willpower", "love" or whatever to the traditional "Hermetic elements" is a vast departure from the actual idea behind those "elements" - not everything has "mind" or "willpower" and you sure as hell can't nail down any of those things enough to stick it in a crucible with your random assortment of "earth", "air" and "water" and bung it over the fire.
Which is why any such additional "elements" are always going to reek of crystals, incense and Dolphin Love on your kundalini.
It's so New Age that it screams 1980's louder than a "brick" cell phone and a Flock of Seagulls hair-do.
Here's a possible twist: have elemental powers based on real elements: Oxygen, Chlorine, Lead, Gold, Fluorine etc.