Diamondback really is not smooth like it use to be, particularly in the very back. The shuffling at the bottoms of the first 4 drops is getting very, very, very annoying (Everything after the trim is fine IMO). I can't really enjoy the back anymore, which is why I've switched to 1-2.
(Go ride Nitro and tell me Diamondback is the "smoothest coaster you've been on".)