Prelude,
It seems that you are planning to deviate from Linkwitz' plans in regards to the mounting of the midrange driver. None of the ASP revisions were ever intended for your combination of rim mounted midrange and rear tweeter, because the midrange magnet mounting entered the design before the rear tweeter did.
Keep in mind that when Linkwitz implemented the magnet mounting of the midrange, he also made changes to the ASP to compensate for the rear bracket. These changes are probably quite small relative to potential sample to sample production variations in driver sensitivity, so they might not be all that significant, but you might want to take a closer look at entry #37 on the Orion support page.