Doing four days is gonna be rough... good luck.
I swapped Solomon for 9F, and it in 0t. That was... quite unexpected. My Dark Grid is pretty pimp though, your results may vary.
Really should've taken Solomon for 10F as well, took me 4 turns to kill the trash, har har. And two turns to kill the boss. But the restriction of having two Healers made bringing damage dealers and debuffs pretty rough, so oh well.