Stehno: I'm going to repeat this again just because I think many people do not really understand it. To get an absolute read on what any receptacle (cryoed or uncryoed) is all about, it is imperative, in my opinion that you run the whole system off exactly the same receptacle or receptacles. I was convinced (for a few months actually) a few years ago that the Arrow Hart 8200 was a better receptacle than the Hubbell 8200/8300 series because I was too cheap to run ALL 8200/8300's in my system. When I did do that it became apparent to me that the Hubbells were better (smoother, much more refined, less forward in the midrange and much more natural).
I am speculating a bit here because I have no experience with the FIM, but from the little I do know, it has a reputation for being a "darker" sounding, more laid back receptacle, which either of the 8200's (cryoed or not) you have cannot be accused of. I wouldn't describe the 8200/8300 as aggresive, but it's probably more aggressive than the FIM. My guess is that the FIM you have would be more similar to a non-cryoed Hubbell 5262 or 5362 or the non-plated (non-cryoed) 8300's that Albert Porter uses.
In my opinion, properly cryoing the 8200 or 8300 (or any receptacle for that matter) gives you a blacker, quieter background, more detailed midrange, more extension and at the same time a cleaner presentation at the frequency extremes. What you described in the high frequencies as being "better" (decay, etc) with the non-cryoed unit is (once again in my opinion based on a bit of experience with this stuff) the slightly "noisier" presentation of the non-cryoed unit combined with a bit of distortion. It's a "zingier", more exciting presentation that is a bit impressive at first (quite detailed, midrange a bit forward, etc. especially after living with the FIM) but ultimately, in my experience, shows itself to be less "truthful" and fatiguing. That is the problem with 1) quick comparisons as compared to living with a receptacle for 2-3 months and becoming accustomed to what it is really doing and 2) combining 2 receptacles (the FIM and the Hubbell 8200/8300) in one system when those receptacles have very different presentations.
My advice to you obviously, when you get your new outlets is to make sure that you're running the whole system on them and eliminate the FIM from the equation. That way, you'll really be able to get a take on them.