I know I should be ultimately aiming for 9-10 max SSR weapons for each element but I have a question.
Let's say I have a maxed SR weapon that is Class X, (Arcana, Sword, etc.) and I get 4 SR weapons that I can combine into another SR weapon of the same element, same weapon class. Should I do so, or use those extra weapons to up the skill of a more potent SSR weapon?
Example:
I have a maxed Wind SR Arcana Weapon, (Wind Charm)
I get 4 copies of a SR Wind Arcana Weapon, (Wind Toilet Paper), that is a different weapon. Should I combine to 4 Wind Toilet Papers to form another Wind SR Arcana weapon to go with my Wind weapons or use those Wind Toilet Paper SRs to up the level of another weapon's skill?

Cheers, thanks!