Going off of the current lineup options from the bigger brands:
Covert Ops, Night Hawk Stealth SE, Fanatic SS, Freakshow Solid, The Fix (symmetrical drilling), Impulse Solid, Game Breaker 2 Phenom (or just Game Breaker 2), Kinetic Ruby, Dare Devil Trick, Phaze II, and Chronic Paranoia.
So everybody has something to fit that criteria. Mostly at least, not sure if the Covert Ops, Impulse Solid, Kinetic Ruby, and Chronic Paranoia really contend for being the strongest symmetrical balls out there.
If I had to pick one... probably the Fix. I think that has the strongest coverstock out of that group.
It would be the Scandal though with Hammer included. If that didn't work for you it might have just been too strong. I know a local EBI staffer that didn't like his because the asymmetrical gave him a better look in heavy oil and otherwise it wasn't/isn't usable.