25NL: JJ Against Possible Steal Attempt & Unknown

http://weaktight.com/1333116

CO is a 16/10/2.2 reg with a 22 ATS. He has 4-bet 43% of the time (out of seven opportunities). His 4B range stat is 4.1%. We have 570 hands total on villain. FWIW, his 3-bet is 5.8%. Moral of the story, this villain like to steal pots pre-flop.

BU is unknown and has only been at the table for two hands.

$0.1/$0.25 No Limit Holdem
9 players
Converted at weaktight.com

Stacks:
UTG ($43.00)
UTG+1 ($22.05)
MP1 ($7.30)
MP2 ($31.55)
MP3 ($7.10)
CO ($25.00)
BTN ($21.20)
Hero (SB) ($25.00)
BB ($25.00)

Pre-flop: ($0.35, 9 players) Hero is SB
5 folds, CO raises to $0.75, BTN calls $0.75, Hero raises to $3, 1 fold, CO raises to $8.75, BTN calls $8, $5.75 to Hero ($22)?

You should know the answer to this question before you 3bet. As you 3bet, I take it you planned to shove. The only way 3bet/ fold would be good is if this villain calls a lot of 3bets but you don't have that read so you must have planned to shove, right?

pretty close between shove and fold, if BU had folded I'd say shove, but he called which is really weird. Usually only donks take his line so he can def have hands that you're good against in his range, plus he may fold to a shove which = dead money... idunno, flip a coin.