NL50: I don't 3b JJ pre, then spike a set...

[Profish2285]

To be honest, I think you decided to mix it up at the wrong time. If you had already 3 bet the CO twice, then now is definitely the time to do it again that you have a real hand. I am assuming CO will probably start to call you lighter and/or play back at you lighter because of how active you have been. I would save mixing it up more for a situation where you have not been as active. If you have been playing relatively tight, then a re raise will only make him fold the range you want to play against. I believe that would be the best time to get tricky and flat call, not here.