Had the same issue with the time gap, this was with multiple moodles on the same server, so no problem with time.
I added it in the mnet/xmlrpc/client.php with "set_config('drift_threshold', 60, 'mnet');" where it checks the time offset, there may be a better place.
M=
Moodle networking (MNet)
Where can XML-RPC time gap delay value be increased ?
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