My usage was definitely weird, but with the way our refresh timings and when I was GCD healing worked out, I basically pocketed Lucid from Titan through Annihilation. The intermission is so long I'd come out of it with about 80% MP, and the only GCD healing that would happen in Ultima before the Titan stomp stuff would be an AH and a Succor before he was targetable, and our Bard would toss out Refresh during Predation and I'd end up capping MP before stomps even without Lucid so I held it so if something exploded I'd be able to use it to recover, otherwise I did the Lucid/Lightspeed/Collective/Oppo thing around the start of Annihilation (this was back when you had to wait for server ticks on Collective so tossing up bubble while he was untargetable was one of the least annoying spots for it) so that I could have the extended instant cast for the movement-heavy phase, and discounted Helioses if the Flaming Crush soak went wonky. The HoT ticks were mostly nice for the bard running to Narnia for Mesohigh and the tank snagging all the orbs, but they also helped out if we had someone missing and the Flaming Crush dot ticked a little longer than normal. I'd leave that phase capped on MP if things went well, which kept things fine through Suppression, and then at the end of Suppression we had Refresh again while I was Heliosing for all eternity, and Lucid would be back for me to use whenever I felt I needed it next which was usually held until Primals.
I remember having a lot of feast or famine issues when I was working out where to pop it--it'd go up alongside Refresh and I'd end up overcapping and wasting ticks then running dry later when nothing was up; I think I ultimately ended up using it less in general, but it gave me the best recovery options without risking bottoming out.
