With regards to the '57 Classics.
On my ES-339 they sound far closer to how I remember real PAF's than anything else Gibson makes.
The "Burst Buckers" in a 2003 R7 I had were totally impossible to "clean up".
They had a "narly" distortion evidently built in. Total POS!
This is NOT how I remember any of my PAF's performing "in the day"!
I still prefer Fralins for an authentic PAF sound. Just my nickel98 on that.
But the "Classics" in my 339 I must say run a fairly close second.
I'll check the Classics and report back on the dc readings.
Guessing no more than about 8k, the readings you got would not surprise me.
Tom