What is your table image? I find I c-bet successfully 75% of the time even with air because I play very tight so they assume I have at least a decent hand.

Also, I find if someone calls me I c-bet the turn again if a nothing card comes up, repping like I have the exact same strong hand, sometimes even raising if they bet into me. Works quite well at micros (at least for me so far). If they call again, then my alarm bells go off and if they raise/reraise me I'm usually done.