Also you need to consider his PFR-range. A 1% PFR'er is going to have a 100% Cbet stat. The higher his PFR and Cbet combined, the more you can probably pick off his c-bets.

As for the Fold to Cbet stat, I just keep the Fold to bet-stat for each street on the HUD instead. I think you'll need quite a lot of hands on someone for the Fold/raise cbet stats to be reliable.