The PG can be described as "focused" since its resonant peak has a higher Q factor than other Duncan P.A.F. replicas. IOW, it has a pointier resonance, more... focused.
Is it MID focused? Not if played at home through a short cable... it can even be piercingly bright in some guitars in such a situation... but on stage, through a long cable in the old school fashion, stray capacitance drags down the resonant frequency and the focused peak effectively concentrates the sizzle... in the high-midrange.
Below is the resonant frequency of a Duncan PG through the kind of long cable played on stage (12m, parasitic capacitance = 1700pF). The peak was effectively "mid focused" in this case (with the nasal tone related to such an electrical response).
Sorry for the crappy pic. It's 20 years old but it's the only one that I've at disposal in this computer right now...
... and I don't post all that to argue, BTW: I just try to explain the logics behind the official description. Deciphering it on the basis of the explanation above makes it more understandable IMHO. YMMV.
Regarding SH1 vs PG for Duane Allman, I've no opinion: the man used relatively clean 1957 P.A.F.'s as well as 1959 ones among the hottest (in his "Hot'Lanta" LP), so I find difficult to recommend a single model.
Good luck in your quest.