Yeah, those are the most current version. Again, not sure if you’re noticing GOUT shots or just optical composite shots that are a couple film generations away from the surrounding ones or not, but these aren’t things that will be improved by getting the MKV version.

You might want to look into the Blu-Ray ISO versions of 4K77 and 4K83 for SW and ROTJ, or the 4K DNR MKVs if you have equipment that can handle 4K H265 video. That will at least eliminate the possibility of it being a lower-quality source patched in to remove a Blu-Ray change, but if it’s just an optical compositing thing then it will still look fuzzier, just in 1080p (or 4K). There isn’t really an equivalent for ESB yet, though (4K80 is a long ways off as it’s going to require a lot of work).

I wouldn’t recommend 4K77 Non-DNR for you as it seems like grain is something you’re not a fan of, and film prints of SW77 are pretty grainy. It’s still there in the DNR release (which the BR ISO uses), but significantly reduced.