Any guesses on timeframe for Tilith's enhancements?
I can't pull a better healer.
No clue, but her enhancements aren't
great unless you use her as a buffer, which you probably don't. They're:
永遠の虹光 (Eternal Rainbow)
Recover 10% MP per Turn
+1: HP/DEF/SPR Up {+10% DEF/SPR/HP}
+2: All Elements Resist (Except Dark) Up {+30% ALL Ele Resists Exc: Dark}
プリズムヒール (Prism Heal) [99 MP]
AoE except Self Recover 2500 HP, 50 MP
+1: MP Cost Down (XL) {80MP}
+2: HP/MP Restored Up (S) {3000 HP, 60 MP}
セレスティアライト (Celestial Light) [53 MP]
AoE 2 Turn +40% ATK/DEF/MAG/SPR
+1: Duration Up (S) {3 Turns}
+2: Buffed Amount Up (M) {+60% All Stats}
I suppose Prism Heal is the only one worth touching, unless Eternal Rainbow's super cheap.
Frankly, I'd save your gil and crysts and wait to use a UoC ticket on CG Fina. Units that are already obsoleted aren't worth expending significant resources on.