So for the meantime, I'll just pray for evo-mats I want to come out of the PEM then? :V
My options are pretty limited (see my padherder linked in my sig)
the keys to low level clearing masks/dublits is knowing when to stall, when to poison, and targeting synced strong monsters and bursting them down
team comp should be as many poisons as you can, other subs should have high HP/RCV and try to go as mono color as you can (ie skip as many colors as you can). don't bother with armor reduction unless you're playing burst.
the first floor is always super weak, so use that to stall by matching off color orbs and hearts (this is where not having certain colors comes into play)
mid floors will have a mix of weak and strong enemies. kill off small stuff with matches and focus down stronger enemies that are synced (target an enemy by tapping on them). when there is only one big guy left, use that time to stall for abilities.
sometimes you might get 4 big ones. don't panic and target the enemies that are synced. if none are synced, target the enemy that will attack SECOND. the reason for this is you are allowed a free hit.
floor 4 always has three elemental big masks/dublits. again target synced ones and kill them asap. if you happen to get unlucky and get like two dublits synced with 1 turn, pop poison. do NOT do this for masks though.
floor 5 if you've saved your poison, use it and bam you win. If you had to use poison on floor 4 then standard target synced etc. for masks though, the mystic mask will attack EVERY turn and fuck up your day, so you really want poison for it.
when trying to kill synced enemies, always prioritize matching orbs that you have more attackers for. for instance if your team has 4 light, 1 fire, and 2 dark elements (sub elements count), then go for the light and dark and if you fuck up the fire one then it's okay. DONT just match orbs willy nilly because you might just match orbs you dont even have and waste turns.