A while back, I came across some very interesting info on Reddit. Someone found out that they can force Miraak's Robes to use the tentacle explosion via firestorm. This was once per cast, however, and not that valuable.

I just tried this with Blizzard, with more desirable effects. I could force the robes to activate approximately seven times.

I then used firestorm just after using blizzard. The result were spontaneous tentacle explosions occurring for about two minutes straight. It turns out that these tricks actually stack.

Destruction mages out there finally have a reason to use master spells, robes, and...well...destruction. I will keep experimenting, but this has opened up some very interesting possibilities.