Okay setting Musicbrainz:Format:Put Original Release Year into Release Year may at least put a date you are happy with in the year field. Even if it isnt actually matching to the earliest version of the release you want you wouldn’t notice this from in your player if the year was set to the earliest.
Yes that does consist of going to the Musicbrainz website but you only have to do it for the one’s that have gone wrong. You can also use Match to One Release, here you don’t have to find a release but you say to Jaikoz that unless it can match all the songs to one release don’t match anything at all.
But the point is this, if the songs based on their acoustid and metadata are still a better match for Release A rather than Release B even after Release B is getting a boost from your options (because its Vinyl, older ecetera) its difficult to expect Jaikoz to automatically select Release A regardless.
You could also try out Manual Correct from MusicBrainz, although its looks track based the context menu lets you modify multiple tracks to match one release, you can also do a Musicbrainz search within it instead of having to go to the Musicbrainz website.
Also, I forgot to say make sure you set your Preferred Countries list.