For breeders with a lot of snakes, those racks are the way to go. For Ball Pythons, those are just awesome.
However, I have to say, I'm not impressed with the fit of the tubs. I could tell it bothered you too. I like everything to be quality, neat and EFFICIENT. Those sticky tubs would drive me crazy.
I don't want them super loose, either, for sure, but some seemed to stick quite good. To the point of moving the rack (since its on wheels) when pushing them in or pulling out. To do it smoothly, you would almost need 2 hands.
When doing maintenance you want to be able to move everything quick and smooth. You often have another hand full with either cleaning stuff or a snake. Tubs should glide easy and smooth so you can do it one handed without jolting the rack or snake by having to push hard or use both hands.
Have you asked whether that is a common problem with that particular rack? The hatchling and / or hybrid one?
I know, I'm OCD, but for the price I would want it to be just right..