Re: How bad is this push?
I think shoving here is fine, especially if you know SB will try to steal your blind. You still have some amount of fold equity because he won't have quite 2-1 on a call. Calling preflop with the 33 is not an option here because you aren't deep enough to play for set value, and if he's (in your words) "c-betting all the time", chances are he'll be first into the pot on the flop and you'll be practically calling all-in on a board that is overwhelmingly likely to bring three overcards.
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