I have the same problem with mine... The only thing you have to do is take out the 4 screws on the back of your controller and tighten down the little metal tab (rachet). You can try just giving it a few turns on the set screw, or you may have to take it off and bend it a little bit.

The only problem with this is that it will wear the notches on the thumbstick gear inside the controller. E-flite just has a bad design in this aspect because the notches arent cut very deeply to prolong wearing. So, no matter what you do, this controller will never feel like your Futaba. It just isn't made the same way... I hope this helps...