GI time sync question

Oracle 11g grid infrastructure install guides clearly say that if I use a time sync service other than CTSS (like Windows time service or NTP), then I must prevent backward time adjustment on all nodes of the cluster. This is done by registry key on Windows or adding -x option to NTP on Linux.
Doing so results in a problem. The time on many nodes of the cluster is running ahead of the standard time source and cannot be synchronized backwards. The net result is that the time on all nodes is out of sync by 30-40 seconds. In few more months, the time will be ahead by several minutes on several ndoes. Our server admins are getting errors in server logs because the time cannot be synchronized. I cannot find any recommendation or best practice document from Oracle on how to correct this situation unless the time on some nodes is adjusted backwards. Any ideas?
Thanks...
Arun

If I bring time forward on all servers, very soon, the servers will be way ahead of the actual time. Also, if I have to manually keep the time in sync, then why use time synchronization in first place??
We do use an external server but I am not sure which one. We want to keep the server time in sync with a standard time source. The requirement that time cannot adjusted backwards makes it impossible to do so.
Thanks...
Arun

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