That is much more confusing to say to other golfers who will be like " How did your Firebird become more stable when it got beat it, it should have gotten less stable when it got beat in". I think saying less stable works better in this instance.
I think that when you are comparing one disc to another saying one disc is "more stable" than the other makes sense no matter the stability of the comparing discs. When talking about a certain disc saying that it's "stable" means fairly straight.
So you guys are trying to say that an overstable disc is not stable. That's pretty silly.
Are we? Or is that noise in the background everyone laughing at you?