Yes, that doesn't look tidy anymore. You put quite some effort to get everything back to nice condition so far, but with that post you face a new challenge. Good luck
Here's a close up:
I do not recall seeing these guides before. Not typical for that era. On top tt was standard. I have seen braze ons left under tt on later models, but those braze ons look slightly different. I must say it is imo the superior way to route a cable in case of aero levers. Maybe it was a specific custom request, but I also think I can not eliminate the assumption that it has been refinished at some later point.
Btw I would think that you could get that 1st braze on tidy again. Dremel rust away with steel brush, a good base and than yellow - should look good in the end if done properly.
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