Depending on how much you cut, your hand positioning may be causing as much of the issue as the flex. If you cut the top, and keep your hands the same distance apart, your bottom hand isn't in the same place anymore. The fulcrum has changed and you're not getting the same leverage on the stick. At 215 lbs, you should be able to use an 87 flex stick.
For example, I recently cut my sticks by about 1/2" but I left my bottom in the same place it was, moving my hands closer together (I marked it with tape just to see). My shot is much harder now because I'm getting more flex and lever action. I can actually feel it.