They could start improving the AI, by removing all those lesser heals. The heals they give themself often effectively only wastes their turn.
Either give them BIG heals like cure wounds or none at all.
Right now the AI often tries to play like a "nice" human. You know healing your buddies, helping them up, but that is not the point. They need to try and win.
It could be easy things at start.
The group sees an enemy mage/ranger, try and create smoke on them so they are forced to moved, preferably something like midnight oil + fire + poison.
Make them ignore a charmed enemy or only CC him once.
A rogue? Time to put poison or fire everywhere.
And fod gods sake forbid them to run for 5 ap, while standing perfectly in front of another target running through 50 tiles of fire just to die.
