Mithra have the big lack in STR while high DEX...I'd say...Just carry both STR/ATK and ACC gear with you and just swap in some pieces of equipment to fit the needs so you don't have too much STR/ATK yet miss a lot or a lot of ACC yet too little STR/ATK to do much dmg. Just mess around with the combo depending on where you party at to find a ideal setup and maybe write it down so you know what kind of gear to use for that area along with putting in a note on the party setup and if there was a BRD present or not.