It’s a tricky one, I’ve found that many pre EB’s vastly differ, even if the same year. Last year I bought a 79 Sabre as I always regretted selling one of the same year. It was a lovely bass, but it just wasn’t the same as my old one. Marcus at Bass Direct was recently telling me how they had 2 pre EB Stingrays in stock at the same time, and they were chalk and cheese. I can believe that having played a fair few in the past, and also found that on old Fenders of the same year and spec.
It’s an old cliche, but a good Music Man is a good one, and an average one is an average one, no matter what the year is.
Sorry to hear your story pal, hope you find a good Ray that you click with.