Now that I've been using the "new" oil for two evenings (i.e, the type of oil that I used so successfully before), the SD cleared up!
The recovery was just as speedy as it was as described in my first post - complete healing in just a few days. If the pattern repeats, it stays that way until you become lazy and skip too many evening treatments.
This means the exact type of "extra virgin oil" is very important, at least in my case. See previous post for details.