I think the problem here is that your velvet blazer is the "statement" piece. The tie should compliment that, not try to compete with it. I like your idea of a forest green tie, but I think a grenadine might be too formal for the rest of your outfit. Perhaps a knit? That is usually my go to when I can't figure out what tie to wear. Not sure if it would work with the brown striped shirt, but a chocolate brown jacket and a black knit is a nice combo in certain situations.
Thanks, I could see a gold knit either working or failing miserably.
I'll keep farting around with it, I'm stubborn like that.