[10NL] Defending against cbets

The best way to approach the problem imo is to ask yourself how much you would value-c/r if you had a set, AA or AJ. In theory that's the amount you should also bluff so as to make your value raises indistinguishable from your bluffs.

Also your elasticity question depends a lot on the villain. Some will call any size with a FD or second pair, some won't.