dirtfarmer, that is a damn nice rifle. I like the way you glassed the action in the stock too. Seems like the best mechanical way to do it. I only say this because that's the way I did mine. I don't know if it's right per se, because of all the other ways one can do this (based on the research I did), but it's the approach I used. My rifle shoots pretty good now too after finding the ammo it likes...
I don't know if it's right, but it works.
Free floating is advantageous with a rigidly joined barrel/action and where you're able to solidly bed the action.
Some custom 10-22 clones, IIRC, thread the barrel into the receiver. You could possibly free float one of those. Even then, the action bearing (bedding) surface is a LOT less than a bolt action. So, treating the barreled action as a unit, putting downward pressure on the barrel/action junction makes sense. And, there's only one action screw, none to secure the rear of the action, which would be nice to have when free floating the barrel.
Rigid, as in resisting movement from the vibration of firing. I know .22's don't create the movement of centerfire rounds, but they all set up vibrations and have their unique harmonics. Dampening all that aids repeatability and thus, precision which technically isn't the same as "accuracy", but folks seem to know what is meant with use of the latter term.
Like they say, proof is in the puddin...
DF
Subsonic almost as accurate as full powered rounds. 50' indoor range in the attic of my garage/shop. No telling how well it would group with good ammo...