1+0 Fast - Middle Phase

250 of 1000 left with 70 "in money". Average is 6BB, Hero has 5BB and AKo in MP.

nobody limps, Hero raises to 4BB. CO with big stack calls. SB shortstacked calls all-in.
Flop (3 players, Pot 11BB) is 3 small cards. Hero bets all-in, CO calls.

Everything wrong? :-)

If Hero raises to 3BB (left 2BB), should he bet anything on the flop (would be 9BB Pot)?

PS. Just in case - Hero's 5BB is almost average.