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OK, here's the results of the heating test:
I had the focuser in a small oven with a thermometer and after keeping it at slightly above 80 degrees for a couple of hours, I let it cool to room temperature. I found that there was a definite change after the heating. It didn't quite develop a slop, but it wasn't far from. This was at 25 degrees though, above the 20 degrees phase change for Teflon, so I put it in the fridge and cooled it to 12 degrees. This time there was a definite slop. Not much but enough to require a fix.
I think that reducing the pads thickness to less than one millimeter should solve the problem.
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