Yeah, as has already been said, that guide was centre punched because it was loose in the head. So, unless an over sized guide has subsequently been fitted, and the guide bore machined to suit... you will most likely still have a loose guide... and that’s highly likely to be where the oil is getting ‘through’. BTW, oil getting down the outside of the guide was suggested back in post #7. But I’m with you, if the bike is running well... ride it. Save the rebuild for a rainy day !