First, massive KUDOS on achievement... there are some teething problems though:-
Some titles for some reason are still missing the 4k download option (well, H.265 altogether, log attached) (not sure if it's title-specific or a problem with SF getting entitlements when titles are bought in UHD bundles, as both titles in the National Treasure 4K bundle are doing the same thing):-

Also, for 4K series, I seem to have to switch to h.264 then back to h.265 to get 2160p download options (otherwise, H.265 is stuck on 1080p only)
Finally, for titles that don't have DoVi at all (but have HDR), SF deceptively defaults to H.264 while showing those bitrates for H.265-DoVi selectors.