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Roxy
G29 P3 isn't intended to populate an empty, unprobed mesh.
The reason for manually probing the corners of the bed were to see how it is tilted. ... You have .75 mm of difference across the bed. Which is 3 layers.
But when you do try to fill the mesh... You can use G29 P3 C #.### R # to populate values where the nozzle is.
Fair enough. I mentioned it for completeness. I haven't found a clear walk-through of how UBL is done. Especially without a probe. I am a total n00b so you can expect me to do unexpected things. And it may have been an actual issue that slipped past your notice.
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Roxy
I think you should try to physically level it a little bit better.
I will. But I will try to print a probe first. Doing this manually took many hours. Being fair, a lot of that time was spent learning to recognise what .3mm looks like. I should have thought more and played less in the beginning.