oh, and in terms of Photon Saber Auras there's also Astral Horizon, which grants the effect of Astral Heal to your entire party. Geolibrium is probably better so you can get that constant HP recovery though just as a note, in order to heal effectively you'll need to get your Potential stat as high as you can, and Potential Up/Potential Boost augments are also really expensive iirc