Wow your hair reminds me of mine from when it was mostly all just long with no/few long layers. I would think trimming your layers would potentially add even more volume to your hair, and it sounds like that's not what you're looking for. So maybe just make sure that when they cut it, they don't cut it too short up toward the crown area. Just maybe long layers again, at best.
(Edited this because my last post was a bit confusing.)
Last edited by Korkscrew; 01-03-2013 at 02:49 AM.