I'd suggest leaving the horn alone and concentrate your changes in the mouthpiece area. Try a Runyon Custom Spoiler #10 with a Rico Plasticover #2.5 reed. Try it with and without the spoiler. These are Delrin mouthpieces, not metal. If you really like metal, maybe a Dukoff M9 would do the trick. I play a rubber Berg 130/1 for solo bari work but go to a smoother, quieter old-style Brilhart Level Air for sax section. This piece also has the biggest, boomiest low end, but doesn't project like the rubber Berg.