I tried the CM for Lightning a few times, but keep getting rolled despite strong FF13 synergy. Gave up for now and cleared it with my normal team, which was pretty easy with native wall and stacking debuffs. Plan to go back and try the CM more later with some team tweaks.
The U++ mech was a whole lot easier than the previous fight, amusingly enough. I just blasted him with a mage team using Ashe BSB as a roaming warrior and double healers to counter his 1hp nuke, and it went super smooth. Team I used for the U++:
Ashe -- BSB (RW to start, then native when it wore off)
Terra -- Ashe BSB RW
Papaledo -- Thundaja, Chain Thundaja -- Ley Lines SB (mage shout + shortcharge)
Tyro -- Curaja, Fullbreak -- Wall
Arc -- Curaise, Protectga -- Medica Blink
RW: Ashe BSB
Videos:
Non-CM Lightning
Mech U++
Edit: Went back and did the cid mission:
CM Lightning - Key was everyone in the backrow to lower damage taken.
PS: Still around if a MP group forms up, but from reading the posts and confusion surrounding the last MP boss, maybe it won't happen lol.