It is a very complicated subject I don't think it has a simple answer. I think you need to consider below factors regarding your cbet strategy.
1. single raised pot or 3bet pot
2. your position and villain(s) positions
3. stack to pot ratio
4. population tendency and adjustments
5. bet size accompanying the cbet freq
6. board texture
Against fit or fold villain who play straight forward postflop, you can make small cbet 100% on all the board and you will be printing money, whether IP/OOP. But it is a big leak when your villain is observant, who is capable of check-raise at high freq as a counter strategy.
You can post your statistics/hands here asking for comments, join coaching websites or reading books. To evaluate hands yourself, I think you need to have some understanding on above concepts and then you know if it is a +EV play. Software like leak buster may also help you identify the leaks.