[zlefin]

Is the problem some of the endgame spells in general or master enslave in particular?
If it's just master enslave; then just address the issue in the simplest way possible: changing master enslave.

If it's in general; then i'd like a full list of the offending spells to deal with.
Perhaps the problem lies with spells that are battlefield but only hit enemies? changing such to high aoe might cover it.

It sounds like many of these issues could be addressed by spell modding easily enough.