Outlaw, as far as the cbet size goes, it also depends. And I'm not talking the typical "well the board is drawy so you bet pot", or anything like that. It's perfectly fine to change your cbet size with respect to your hand, and the villain you are playing against. If I am against a fish, and feel a cbet is profitable when I don't have a hand, I'm obviously going to cbet the least amount possible that will get the job done. There is really no reason to balance your ranges, or have the same raise/bet size against an individual that WON'T pick up on your tendencies anyways.

So, yeah it's perfectly fine to change your cbet size; however, I don't think always making it smaller is the correct play. As you should always do in poker, evaluate the situation (your hand, their range, the board), determine what your action should be and why (for value, as a bluff, they call with these hands, they fold those hands etc), and the tailor your size to do the job. If their range is weak and you have a strong hand, then you can bet smaller to induce calls from the weaker range (barring draws, etc). If their range is weak, and your hand is weak, there is no need to bloat a pot that if called you aren't going to win.