My procumbrens are both cascades. I did have one that I unwisely killed, but what I notice about this species likes to cascade. I had one that I sold recently that I had originally tried in a slant style, but the growth pattern just kept pushing it toward a cascade. I ended up with a 26" cascade with lots of twisty turns. What I found was the top apex of the tree was the weakest part and I always had to prune the lower parts of the cascade hard to force growth upward. This species is hell on your hands too. Itchy and whelty when I didn't wear surgical gloves. My hands have toughened up some and I worked on one for the afternoon and no gloves!
I have found this species to be fairly forgiving. Watch out, the growth can sneak up on you and before you know it the foliage has doubled in volume. I trim at least 30-50% off a couple of times over the course of a year. Now these trees have been cultivated as bonsai for over 20 years, so they are used to it. The trunks don't thicken quickly from my experience. The are great at back budding in the crotch between branches, though. They can get leggy so regrowing smaller sub branches is easy if you need to. All in all a species I like, especially for a cascade.