1) Boost the summon's overall fighting ability
2) Remove the power attack feat they have
Seriously, they're not even good at fighting (low AB, low damage rolls); then when they switch to power attack, they're AB drops further more
Anyway, if I was given a chance to define the palemaster summons, it would probably be like this:
Animate Dead - Skeleton Warrior, Zombie Warrior
SUmmon Undead - Elite Skeleton Warrior, Elven Mummy
Summon Greater Undead - Zombie Lord, Vampire Monk (the fella at the duskhaven crypts)
--> When the PM hits epic, perhaps give it a chance to have bigger summons something as tough as a baalor perhaps?
- Just some suggestions, hope you consider it.