In the next battle, always take out the PSICOM Scavengers before any other enemies because they are much more dangerous than just the basic soldiers. The same can be said for the next battle; PSICOM Predators can cast Curse on you (increases the likelihood that actions will fail and also gives a boost to the success rate of enemy attacks) so should be removed before focusing on the lesser enemies or battles can get ugly.
Before stepping back on to the ice, follow the path to the end where you will find a Treasure Sphere guarded by a PSICOM Warlord and friends. These enemies are tough but focus on the lesser soldiers first and then tackle the Warlord. If any character is injured, the Activate Manadrive notification is your cue to heal quickly. He will pummel you with this powerful attack and probably kill any injured party members, so be vigilant when fighting him. Collect the Fortisol for your efforts.