I have no problem with scales exhibited in Melt and such, but I have issues with scales that "go back and forth" over the controller, like toy con H and classic 10 EX. I'm not really sure what to do.
Screen Hyper might be the best one for this, it gets you used to the small back-and-forth movements rather than full-scale ones. Other than that, you just have to find a natural way to just start going the opposite direction immediately.
If I get the chance to, I might make a Carnival EX video showing how I do the scales. If I can't perfect it like I used to be able to, I won't put it up though lol.