I am afraid I can't help with your M50.2 problem, but I can sympathize. Less than a year ago I decided to re-rip all my music CDs to FLAC format. I forget what tool I used the first time, but when I finished the metadata was such a mess I found a new tool and started over. The second time I used dBpoweramp CD Ripper. When I had a classical album with all the confusion that can bring I could bring up multiple metadata sources, choose the one closest to what I wanted as a starting point, and then edit it until I was satisfied. Only then did I run the rip to FLAC. Often enough I would find that even then there were issues. I would simple run the program again, insert the same disk, and let it bring up the metadata it saved the last time. That I could edit without having to repeat the rip.

None of which does you one bit of good. I can say that any ripping process that does not put ME in control of the final metadata would be totally unsatisfactory.