I wouldn't bother with direct hit unless you're going all in with 6 materias on everything, that 1 direct hit every 150~ casts from having 1 meld is not worth it, nothing is going to die that wouldn't have died anyway because you got one direct hit broil, and you can't direct hit a heal, you're better off just using food with direct hit on it.

For melds, crit is your obvious first choice, then I'd say det, spell speed isn't so great anymore since we have no regens ourself and only 2 DoTs now (3 in AoE) and those are all spell speed is helping, while det effects your heals, damage and DoTs.