The content-skeleton/content-slots provide the note slot (the others, relating to &.howto, &.qa, etc are specific to the precalc skeleton and are not related to the padding applied to all notes), and the precalculus-slots provides an alternative slot to put in place that overrides the default 0.5em padding from content-slots.

If you have a way to do it whereby a @type argument does fix the issue of mixin overriding I want to do it that way, but right now I'm not understanding how it would work.