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The OCXO module has temperature controlled crystal and the synth is outside the crystal chamber, two separate layers. I've not tested mine on other modes than WSPR (0 drift), so can't tell if it has some offset or tail after parking. I need to rig up the frequency counter and logging for this, perhaps get time to do it as well (:

Using a GPS is the same as with the standard synth module, the U3S does not know the difference. So if you want absolute frequency then the GPS is helpful, if just a stable frequency then no GPS is needed. Timing of the transmission is still helped a lot by the GPS.

Naah, I bet this is temperature related somehow, just hard to isolate which parts play a role and how to eliminate them.