My experience was similar. Probably made me a better skater for having had the experience, but going back to a 10' for the first time in years was sort of eye opening. It dawned on me that the idea of a quad or a multi-radii profile is somewhat flawed in that I'm not sure you can really have the best of both worlds. Eg, agility doesn't just come from the front part of the runner. If you flatten the back to add stability, you're going to notice it in other aspects of your game. You're definitely going to lose some agility, somewhere.
Further, I don't really feel that "unstable" on a basic 10' with neutral pitch as compared to a quad. I'm right where I need to be on my skates and I think that translates to being the most stable, IMO. That's certainly how I feel on the ice, anyway.