Yeah i do know that synastry is absolutely amazing for double preys because you can top your tank off while hes getting cleaved while also healing your prey thus making that part of the fight pretty laughable as an astro. The gun repod was a pain just due to the fact the only aoe healing astros have is aspected helios and helios. Lightspeed is also pretty good for mp management + when needing to top people off with the backfire of lowered dps.