Here is my staple combo at a corner:
b3, 1, 2, db2+block, 3, 3, 4, 1, 2, Shocker, 3, 3, bf3 (14 hits, 40-41 damage)
although most of the time I skip the db2+block. If you want to go for maximum hits you can do:
b3, 1, 2, db2+block, 3, 3, 4, 1, 2, 1, 2, Schoker, 3, 3, bf3 (16 hits, 41-42 damage)