I've got a collection of Firebirds I'm actually trying to fit into this role. So far my 2017 Sexton Tour Bird is the closest. My FAF old Star is the most OS and my pearly champ Bird is somewhere in the middle. Doubt it will beat into straight though. Next on my list is a DX Bird specifically for bashing into trees
In my bag currently I have an old ce-like pro firebird from well befofe I started playing that is kinda overstable, a star flight number par # that is straight with little fade, and a weird old pearly champion one I found at play it again that will actually turn a decent bit. I got tons of the stiff FAF star ones that are stupid beef that I will hardly ever use. I like broken in firebirds. They are really good straight flying discs once broken in a fair bit. haha.
From what I have see the dx ones get silly flippy fast. I havent thrown one tho.