Your basement is probably seriously pitched like mine for drainage so moving any game, even a few feet, will require some top and bottom leveling. I set mine at 6.7-7.0 depending on the game at the slings and then do my best to get the same at the highest measurable point on the playfield. It takes a while to dial it in (especially when you have to crawl under the game and turtle shell it while adjusting the levelers) but I have a JM (6.9 degrees) and that ball should be a lazy drop to the right flipper.