>LoL.  Because it's the only thing you can think of...
Thanxs for the misquote. I didn't say that.

>high impedence momentarily?
If the wiper or its mechanics is flimsy/weak that would be likely. 
If it isnt, and keeps a high contact-pressure the other option is more 
likely. (Not sideways, inline) There probably is a magnectic coupling 
between in-outside which has spring-properties that could be the reason 
for overshoot (jump) during fast stops or vibration.

>wiper unloaded and put a small cap
>single R-C low pass filter
It is practically unloaded (100k)and there is a 1uF cap to 'remember' 
W/o that the noise from the pot is terrible. (2v p-p)
It isn't the norm to connect these pots that way. (cap and R-C filter)
But the cap helped, and I bet a R-C filter would do a little too. But
its not fixing the real problem.

>industrial position sensing pots
It is, but straight 100mm. Don't know how many wipers. This kind 
is supposed to have no noise from the wiper. Be linear to 0.05% 
(laser trimmed) and last many cycles (100M+) And they are not very 
cheap.

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