I have 2 HR Bergs (and a great old metal Berg @1960). I don't play 'em much any more but I have always had good success with Winslow ligs on these (and other pieces -- I'm using a Winslow bari sax lig on my RPC! The RPC is huge!). Winslow ligs are a bit pricey, I admit, but I think they're worth every penny.
I forgot: I also have a HR Berg bari piece, which I do use for jazz; it's a very good piece, and the Winslow bari lig fits that fine. Someday I'll get my RPC bari piece, and I guess I'll have to use a bear trap for a lig on that!