MP management?

[Estellios]

It might be a good idea to skip casting Stone, at least on Anglers. They are water-based and resist earth, but are weak to Thunder, so the magic evasion debuff isn't really necessary on them and the poor damage Stone will be doing is not worth the MP spent, which will add up over time. Even Blizzard's Gravity effect may not be necessary and will probably give you a reason to use Sanguine Rite, get hit, and recover MP which will also help in the long run.

I had a LS member that was soloing those recently on THM and getting Chain 5's so it might be that you may need better gear if you haven't upgraded recently, or maybe try eating either magic attack or magic accuracy food depending on how often you get resisted. Having unresisted combos goes a long way in MP conservation.

Also, take a moment to recover some HP/MP on chain 1 and 2, it will help out as well.