My 335 was made in Memphis, but I don't believe it has the "Memphis" wiring. All indications from the Gibson product page are that it has the '57 Humbuckers and regular volume/tone setup it's had since day one.
Perhaps the guitar I played was a 359 rather than a 356? I could have had a brain cramp. In any case there were two distinct issue I had with the sound.
First was the brittle nature of the tone (with all pots set on 10). I played it through a '65 Blackface Deluxe Reverb like I normally use. There was plenty of articulation in the notes but it lacked the "woody" undertones I was looking for. As I suggested in my earlier post, this may be due to the ebony fingerboard. My ear hears the same sort of thing on many Les Paul Customs with maple tops (the all mahogany versions sound better to me). I had a 40th Anniversary Les Paul with P100 soapbars and an ebony fingerboard and it was somewhat sterile sounding to my ear as well. YMMV.
The second issue was what I perceived to be a flaw in the wiring. When the volume pots were turned down it turned the volume all but off at about 5 or 6. Tone was the same way, as there seemed to be no additional highs rolled off after about 5 or 6.
I'm chalking it up to a chance occurance on the one instrument. I've had the same thing happen on seemingly identical Les Pauls, where one sounds lousy and the next one on the wall sounds phenomenal.