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Paul,
This is really intriguing. I only had a TEC140 on my PMX so you are a lot heavier. However, I never saw the oscillating issue both you and Greg have seen. Hopefully Greg's unbalanced idea will work though it does go counter to SB's advice with these mounts.
Have you tried unguided + Protrack as a diagnostic? It would seem that you ought to be able to go at least 5 min or so if you have a good model and accurate PA, though I guess this also depends on your FL...But, surely a few minutes. If not then perhaps something else is wrong, like PE not sufficiently corrected. Have you measured it recently? What does a guiding log look like if not making any guiding corrections? Is it wavy? Ray's idea makes sense because I doubt that a quickly changing PE could be corrected with .2 max moves + 10 sec guide exposures. But, .5 sec exposures or so probably would keep up with PE.
Anyway, just a few random thoughts.
Peter
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