What if you reset the swatches or load a smaller set? Then you'll have less swatches to delete by hand. And once you delete them, maybe you can create a new set with NO swatches, so every time you prepare a new set, all you have to do is load the empty set. Also, if you keep the Ctrl key pressed, all you have to do to delete a swatch is click on it. Might make it easier to delete the swatches one by one. You probably already know all this, but that's all I've been able to figure out. I'm on PS6, too, and I hope this helps.