I've been looking into this mon's potential as a stallbreaker actually! The set I've been using takes a different tack to yours, however:
Urshifu-Rapid-Strike @ Metronome
Ability: Unseen Fist
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Substitute
- Surging Strikes
- Drain Punch
- Thunder...