The alignment on the second load of houses you added looks fine. Basically you need to align property boundaries to the OSMUK Cadastral Parcels overlay, as that’s a source of ground truth about alignment. The aerial imagery can be offset by up to about 2m in either direction, and that offset varies unpredictably across the country. It also changes every few years when the imagery is updated. The Cadastral Parcels don’t as they come from the Land Registry which is surveyed on the ground quite accurately.

There’s also parallax error to account for, so if you can see the side of a house in the aerial imagery, then move the geometry you’ve drawn so it lines up with the base of the house (not the roof).

It’s a bit complicated, but once the geometry is drawn and lined up, it should basically never need to change :)