Hi, Connie - I will defer this to Dr. Kellon, but here is my opinion:  This ACTH is solidly in the "grey" area.  The Liphook study showed confirmed PPID horses to have an ACTH more than twice that of normal horses.  This number could be one of three things:

Normal variation, but a bit of an outlyer, for a normal horse.

Early PPID, needing pergolide only during the seasonal rise.

"Normal" PPID, but a low outlying value.

If this were my horse, I would certainly consider putting Falki on pergolide for the periods of now until the end of  March (don't forget to wean off gradually in March, rather than suddenly stop)  My reasoning here is that he had a lot of trouble last year in the winter; if there is lurking PPID, then pergolide is cheap insurance.  My two major PPID's (as opposed the the "minor" PPID) horses actually peak their ACTH in November, not October like the rest of the free world.

Glad the abscesses are improving.  Please keep us updated!