I balance the mount with the scope horizontal in both axes.
I check it isn't wildly different at the usual imaging angle. With a scope mounted on top that will be different to horizontal so I check at the usual imaging angle and adjust to that rather than to horizontal.
As far sensitivity to balance I find my PME very tolerant. It has been at times somewhat out of balance but I still got round stars. The beauty of a heavy duty mount.
But for PEC etc you don't want any other factor in the way. I don't have a shifting weight balance. I know a lot of mounts say to weight the west side slightly so the gears are always meshed. I am not sure if that is true with the PME as it is belt driven but perhaps it is.
PMX - it may be different, its not as beefy as a PME so weight balance may be more important but I suspect its not as critical as with other mounts.
Greg.
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