You want to recast the song, means to cast, then deactivate it again, because only switching it on gives you gains.
More important than that I found manareg, but with no fc/fcr, your casting will be pretty clunky.
Since you'll wear out your equipment anyways, might as well get a training suit with lots of regen. Regs, lrc and so on are unneeded, so it should be easy to get such a suit.
Btw, still doing Disco, 118 now and slowly working on it.