Don’t bother for arena scoring for dancers; their scoring will always be quite bad unless you have them merged at +10. So, +Atk -HP is your better bet
Give LA!Lyn +Atk -HP. You can give her Quick Riposte seal and Guard B Slot so she doesn’t get destroyed by doubles and specials.
As for W!Lissa, I would say +Res -Spd is better due to Bold Fighter. But it does kill her perfect arena scoring, so if you are going to use her, use +Res -Def for arena.
As for Lene, No.