See if you can order the original Aura, instead of the Mystic (plus, the mystic will be on close out soon, so you'll be able to save major $$ on it if you wait a few weeks).
The Mystic (for me) was early, "rolly", and good for fresh flatter non-THS patterns; it needed volume even with surface alterations from 500(OOB), to 1k, 2k, and 4k with polish. I tried each surface on multiple patterns, added a weight hole when the ball wasn't reacting with a manner that I found acceptable, used it on THS, sport patterns, the Red-white-blue series of patterns..... I just didn't like the ball.
If you want something similar to the Melee, but just a little stronger, see if you can get any of these balls:
1. Aura (original, first release in the series)
2. Mean streak Brawler
3. Ringer (burgundy, first release)
4. Dude (DV8 but owned by Brunswick)-- this would be the closest ball to the Melee; its Brunswicks/DV8's version of the HyRoad from Storm
5. Diva (with polish)
Each of these balls would be a nice complement for the Melee; also, you could just drill up a new Melee, but change the surface and layout strength.