and come to think of it that's just drivers I was thinking of. The Dicraft FLX Drone is the most overstable in my bag and I have a flick, force, ect. The FLX drone definitely take the cake though. The regular D version is nothing like the FLX. The FLX breaks hard!
LOL, you must not have the snap or arm speed then. I can flip a groove all day long!, Whippet-X are great overstable discs and Forces generally fly dead straight and hook up towards the end of their flight for me.
Although the Whippet-X is rated +1/+5 I find the Gateway Spirit to be more overstable then any Whippet-X I have thrown.
I would personally say that the latitude 64 halo is the most over stable disc i have ever seen anybody throw. But i totaly disagree with mr ellis. Im sorry but we play a lot of courses out here in washington that have 194s that are a 20 and dog leg left to where a nice hyzer isnt going to get what i need. I normally have to throw a spike hyzer and hope that i get it where i need it. So i like to have a super super overstable disc in my bag for those quick hard fast breaks that i need.