I imagine using a bit of Agility won't hurt at all either with Gaia, the faster you get those double shots off, the better. It'd also probably help increase the speed of melee in mode 2, making it better overall as well. So.. C AGI/OC ATK should do fine I imagine.
OC6 [BuCUE Twin Railgun, Hi-Nu, HeavyArms Custom EW, ReZEL] OC4 [Kerberos BuCUE, Cold Climate Repair, Dendrobium, Double Zeta(S)] OC3 [Unicorn(A), Dendrobium(SR), ReZEL Commander] OC2 [Masurao, Unicorn(S)] OC1 [Susanowo, Zeta Gundam(S), Magnetic Coating, Banshee(A), Alex Gundam Chobam, GM Sniper 2(White Dingo)]
Admiral Akkaraju: You disgust me, Commander. You are a traitor and a coward!
Sanjuro: Sir, shut the hell up, sir!