At first I was disappointed because I had it in mind that I wanted to keep full uncompressed MKVs of my blu rays but once I started using Fab + Handbrake (CQ 21 for blu rays, 19 for DVDs) I found that I could reduce file sizes by half or more without any noticeable drop in quality at all (at least to my eyes). This happened with multiple disks and nothing else running and since I never could figure out why it was happening, that's when I switched to DVDFab's HD Decryptor which has worked fine for me ever since. You're making this far more complicated than it is and/or you're doing it incorrectly.I tried MakeMKV first and thought it was great but after the first couple rips I started having my laptop BSOD on me at least once for every 2 or 3 rips I tried. You'll also find that the meta data for most discs (although not always every layer of each disc) will also load in when you pull up the correct folder with all of the individual files.

If you do a search, I believe instructions on how to do this correctly are on this site somewhere. You just need to look in the right place for the files when opening them in DVD Audio Extractor. You don't need to do anything at all to divide tracks using MakeMKV + DVD Audio Extractor. It takes more like 5 minutes for me to then rip the decrypted hi-rez files for an entire LP to hi-rez stereo FLAC with DVD Audio Extractor. But once the blu-ray has been decypted, it shouldn't be taking an additional hour for DVD Audio extractor to do its work. MakeMKV takes a while to decrypt a blu-ray (maybe a half hour to an hour IIRC depending on resolution and amount of content on the disc).

I just keep the page bookmarked and copy & paste when asked for the key. The key is like 40 letters and numbers, so I'm not sure if it actually changes or you just have to simply re-enter the same key again. It's a sticky in the news and announcements of the discussion board on the MakeMKV site. AFAIK it's continuously in beta but you need to re-enter the key periodically to update to the current beta version. Click to expand.You're making this far more complicated than it is and/or you're doing it incorrectly.

How to update makemkv beta key