Well, more interesting stuff tonight. Started wiggling more on the telescoping pipe, me holding the upper, wife pulling on the lower. Still can't get it to budge, but a small bucket load of golf-ball sized creosote rained down on us. So, I started probing some more, and I'll try to describe what I'm seeing.
First, I ordered an "insulated smooth-wall flex liner", and did was here on install day. I saw them take a coil of smooth wall flex liner, unroll it in the driveway, then wrap it in a blanket, foil, tape... and I think there was a wire wrap or sock over that. The intallers had cut the liner very short, perfectly flush with bottom of old clay tile chimney, and crimped the end of the liner to slide inside a stovepipe, with no retaining screws. When I discovered that during my first cleaning, I installed an appliance adaptor (described in preceding pages of this thread) and the telescoping stovepipe.
Well, when I look up now, I see a white insulation on the outside, and my appliance adaptor, with gobs of puffy creosote between the insulation and appliance adaptor. I knocked that all out, and if I stick my hand up farther between the insulation and liner, I feel and see more creosote. Also, I feel a collar covered in foil, about 1" larger than the liner, which may be the sock I remember from the install, but it seems to be rigid... almost as if my 6" flex pipe is inside another rigid pipe. Just can't figure that out (can't see, can only feel, since it's up inside the clay tile liner), and can't figure out why there's so much creosote between the flex liner and insulation. I think it can't have come from the old clay liner, if it's INSIDE the blanket, and there's just way too much to be remnants from a poorly cleaned chimney.
I think it's time to pull the liner, and figure out what's going on. The only question is, do it myself (no second set of hands to help me), bring back the guy who did this install, or take a chance on trying another chimney sweep.