I know exactly what you speak of. I usually lift the back end of the rack first, then I move it forward. That usually eliminates the stick-factor. That said, I'm curious how a new Diamond rack performs versus one that's gotten some use.
The rack I used has not had a lot of use, while not new it's on a 7 footer table in a back room that does not get used a lot at all, it maybe has 100 hours of play on the table.