The one thing I will say about any of the gyro putters as approach discs that took some getting used to…I was throwing my bullfrog on hyzer at like 60% power for approaches most of the time, or if the line called for a more straight shot I'd give it a little nose up floaty flex line. Just an easy toss to the bucket. Even my proxies, if I threw them the same way I'd throw the bullfrog they'd want to hyzer out early. Seems like if you start them on a hyzer without a lot of spin they don't want to flip to flat very easy. Not the discs fault, just had to get used to how they liked to be thrown low power. I'm finding a low movement more wrist snap type of throw works better at shorter distances.
As someone that used to throw Proxies and now throws Bullfrogs, the Proxy (and Axiom/MVP discs in general) is definitely more torque resistant and I'd say more overstable than the numbers might lead you to believe.
A fresh Bullfrog might have similar stability as a Plasma or maybe even fresh Electron Proxy but will beat in pretty fast and be more sensitive to bad throws. A Neutron Proxy will handle a lot more, at least in my experience.
That said I use the discs somewhat differently; I'll use my Bullfrogs for slow glidey throws that plop down, hyzerflip turnovers (beaten in) and short straight drives. The Proxy I used more like a midrange.