I am currently building my first custom shower and have just completed the final thick bed mortar a day ago. After checking the slope (looking for either 1/3 bubble on a torpedo level or 1/4" rise per linear foot) some areas are not sloping properly due to poor screeding. In some areas the surface is wavey and the worse spot is level from the wall to the drain. I am making it sound like it is a terrible job, however, I think I may be a little picky since this is my first job like this. When I roll a marble around, 80% of the time it finds it's way to the drain. I am using Laticrete's Hydroban and have done everything by-the-book up to this point. I will be applying the final coating of Hydroban once 72 hours has expired on the final thick bed mortar application. I am figuring that everything is ok because I can pay close attention to the thin set application to make everything perfect. Need I worry so much???