You would meld whatever the rest of your gear doesn't cover, considering you have.....all the room in the world for improvement there's no real answer.
If your STR or PIE wasn't at cap with proper gear, you'd meld whichever you were lacking. If you can cap both with gear, you'd probably meld ATK.
And yes, this would be a gear thread question, but no one seems to use the gear and craft threads anyway so whatever.