OK, so I took some time tonight to do a little research into this, and, as it turns out, both of us are right, kind of...
So, first I took one of my EX-1s and plugged it into my HD500. I set up a simple patch with a volume pedal effect, and I set it up to be controlled by EXP2. I set the min to 0% and the max to 100%. Then when I rocked the pedal back and forth, I notice a similar thing as you're describing happen with the Mission Engineering pedal. I'd at about 80% or so through the sweep the volume pedal goes to 100%. So it does seem like the jack for EXP2 is set so that it needs to see something less than 10k ohms to go to max.
However, just because I was curious then, I hooked up the EX-1 to my M13. I set it up to control the volume pedal effect again with heel at 0% and toe at 100%. What I found surprised me. The pedal exhibited pretty much the same behavior. By the time I was at 80% or so, the volume was at 100%. I've been using the M13 for over 4 years now, and this is something I've never noticed! I think it's probably I do not really use the expression pedal to control volume, but rather different parameters.
One thing is that I think the actual construction of the EX-1 is such that by the time it's at 80%, the treadle itself is almost at horizontal, and when you're actually stepping on the pedal, you hardly notice that little bit of extra travel down to the toe stopping point. The only thing I can think is that perhaps Line 6 intentionally wants a little wiggle room at the top of the sweep because that part is the hardest to accurately control. I would venture to guess that the EX-1 works the same with all Line 6 products with the expression pedal input. Perhaps because the Mission Engineering pedal is using a pedal design where the toe-down position isn't really horizontal this extra travel is more noticeable.
Also, I should add, just to check, I did measure the resistance with a multimeter, and it was 10k ohms.
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