You did the important thing, mark your starting point. Go ahead and adjust it, and see if it improves. It helps to lubricate the adjusters before proceeding. One thing to keep in mind is, when you level it, you may also alter it's movement in and out so be sure to check it's movement before you finish. A very small amount of adjustment adds a lot of movement in the slide itself. Be sure the slide does not bind in the opening also. There's not a lot of clearance.
2017 Crusader 315
2016 Boston Whaler Montauk 150
Former Montana owner
Colorado Cruiser, Over the Pass and Down the Hill