Trying to recapture to be sure I got the above right: you had an F9P rover receiving RTK corrections from your own F9P base and the F9P rover got RTK fix but your Topcon sr still does not work with your F9P base? Progress in any case. Hopefully someone familiar with Topcon sr will figure out the issue.
Probably makes no difference here but I’m puzzled about the base coordinates being different as reported by SNIP. I run SNIP too, my RTKBase feeding a stream to snip and in my case SNIP reports exactly the same coordinates as I’ve entered on RTKBase. Are you sure you are using TIME MODE “2-FIXED”?
Your Topcon tool reports coordinates at extreme resolution. By default F9P uses 6 decimal digits (hope I got this right from memory) and 8 digits in high precision mode. Seems you are configured with HP which is essential but no further resolution is needed. This should be in some mm range, a fraction of practical accuracy anyway.
I’m not sure if it makes sense for you to more to RTKBase just to cover some RTKLIB details. You would need a Raspberry Pi, not too expensive to try though. I see you have a paid SNIP app, I’ve never paid anything for AG GNSS SW, perhaps I’m too concerned about spending a few dollars. I understand you have used some excavator tools, I guess those are even more expensive than commercial agriculture GNSS tools.
RTKBase is discussed here:
More here:
I’ll add more about my RTK base experience via a private message.