I guess I don't understand the problem now. Does the entire slide need to come in 3/4" or just the top? If it's out of level, and just the top is out, then it may be a shimming issue. That was the problem with our powergear slide as well. Either way, it's a job for the dealer.
Brian, Mary, kids, beagle - Moose, and mutt - Maggie.
2012 Greyhawk 31FS
2013 Ford Explorer Toad