A bit late, but for your Enfeebling set, you could pick up a pair of Goliard Clogs. A pair of Bricta's Cuffs or Morrigan's too, for when you can't benefit from the Master Casters. Goliard would make a good substitute as well. I recommend Bricta's since they make a great Slow and Paralyze piece as well, and would only carry Morrigan's if you had full set to nuke in. If you can get a pair of Nashira legs, that's an upgrade as well. Balrahn's Ring over Insect (obviously,) and definitely use Chatoyant or the Magian +3 M.acc affinity ones (at least for the must land spells.)
Here is mine for non MND boosted ones. I use Ice and Wind grips for Bind, Silence, Gravity. Bugard +1 for everything else.
ItemSet 325217