Damage test from the Baran Falls Piranhas:
Level 12 Sabin, Front Row:
-Gear: Spirit Claw x 2, Bandana, Karate Gi, Knight Cape, Black Belt
-Stats: 63 Vigor, 288 BatPwr
-Damage per Strike: 212 - 233
To be clear, there was only one instance of 233 out of around 12 total attacks for the entire chain (he got off a lot of counters from Black Belt). They were mostly 220 or lower.