First of all when you do a trick, make sure that there is no little knot by the bearing (this can happen without you knowing sometimes, creating responsiveness). Next, make sure that no unneccessary strings are rubbing the response the wrong direction causing the yoyo to bind during play. If none of these things are the problem, the bearing could be to blame. Sometimes bearings will become responsive and need to be cleaned and/or lubed. Here is a great link on cleaning bearings: How to Clean Your YoYo Bearing - Yo-Yo Mods and Maintenance - YoYoExpert
Hope this helps.