if you have not tried
use the Giant's Glove  in battle with your attacker
as the cast Saber when used in battle
also Fast/Haste help as well
may be use the Healing Helm
as the cast Heal when used in battle
the items do NOT  get lost when used

a good thing to do is with you main attacker
pump the hit rate and attack

one main attacker
a main healer (heals ever turn)
the 2 others
a mix of both