My suggestion is for more sets like "Overwhelming Force", the Universal Damage Invention Origin set- attuned, unique, but not Superior levels. Instead of Universal Damage, each set works in specific damage powers: Smashing, Lethal, Fire, Cold, Ice, Energy, Neg. Energy, Toxic, and Psionic attacks.
An example would be a set called "Future Sight", which can be slotted in attacks that do Psionic damage. The proc enhancement would be a short +Defense boost. Set bonuses would be similar level to Overwhelming Force, maybe even sharing some, plus new bonuses not seen in other sets. Maybe +ToHit (instead of +Accuracy), or resistance to types of debuffs?
If you like the idea, feel free to suggest other set ideas. I feel the procs should avoid effects already associated with that damage type (ex: Ice doesn't more Slow Movement, maybe chance to create a small fog patch?)