Module addon works OK, also on your site. Here is VIDEO from my "investigation": (REMOVED)
My suggestion is ... for subpages uses Pages, not Articles !
Why? becuase 2x less resources has to be loaded, and SPPB editor works faster.
Yes, it's possible that some modules may not work inside SPPB becuase they use too much javascript, but we don't have magic fix (pill) for that. You can always publish extra module using content-top or content-bottom position - in that cases - then no conflict with editor.