Thanks guys,
Looking at the resistance specs for a new unit, I can clearly see that mine is hosed. I'll replace it and get back to you.
Here are my specs, as last measured:

Between Top and Center Pin
closed 20K
1-2mm 3-4K
.25" 5K
.5" 7K
1" 9K
1.5" 10K
2" 9K
WOT 8K
Between Center and Bottom Pins
Closed 20K
1-2mm 10K
.25" 10K
.5" 6K
1.0" 7K
1.5" 7K
2.0" 6K
WOT 6K
Here are the specs of a new Pot, based on UKEvos measurements.
35mm 1.070k (First place I see a change)
35.80mm 2.00k (Very rapid ramp up to 2.0K from 1K in the space of less than a single mm)

36mm 2.35k
37mm 3.35k
38mm 4.25k
39mm 4.95k
40mm 5.55k
41mm 5.95k
42mm 6.35k
43mm 6.80k
44mm 7.10k
45mm 7.30k
46mm 7.60k
47mm 7.80k
48mm 7.90k
49mm 8.15k
50mm 8.20k
51mm 8.20k
52mm 8.28k
53mm 8.28k
54mm 8.32k
55mm 8.50k
60mm 9.40k

65mm 9.50k (peaks here, then begins to fall)

68mm 9.40k
70mm 9.20k
71mm 9.10k
72mm 8.90k
73mm 8.80k
74mm 8.60k
75mm 8.45k
76mm 8.25k
77mm 8.10k
78mm 7.85k
79mm 7.60k

80mm 7.50k (Plate bottoms out - no more travel).
I don't think he mentions which pins he's measuring against, but its clear that mine is toast.
Thanks all.. and let that be a cautionary tale to everyone else with these symptoms...