My middle seats seem to stick sometimes too... What we end up doing is putting the seat back in the verticle position and use the momentum of the seat folding down along with lifting up on the handle to get it. I've noticed that if the seat is half way folded down, it's really difficult to get it to flip forward. I can only seem to get it in that one smooth motion or it doesn't work. Hope this helps a little bit, good luck!
07 XK - 3.7, QT1, 28% Tint on Front Windows, Vent Visors, Rear Grab Handles, OEM Hitch