Solid State or Tube Preamp mated with Tube Monos?

Sounds as though you have not only have searched out many options, but are for the most part, are pleased with what you have. But I understand, change for change's sake, although sometimes not listenening for several days is also a nice change and a reminder of how good your sound is when you come back to it.
That being said I'll offer up this because I owned the P220's for a couple of years and loved them. For me they excelled in inner resolution, and because of that I at ist ran my AA Capitole Mk.II cdp direct and than used a
Placette passive which was a nice improvement.
Have you tried or considered a passive?; Music First or Bent Audio or either the passive or active Placette?
Might offer a little bit more of what your system is capable.

Somut, of course I recommend tube preamps over transistor as being more musical :) but whatever you've heard in the past, keep an open mind and for best results audition the preamp at home with your gear rather than anywhere else.

Happy hunting!

Don't mess with success. If you get a chance to put some other top line pre-amps in your system for a few days, do, but only for information. If something blows you away, then buy it, but otherwise just stay informed.

SS vs. tubes makes no sense to me. In their top incarnations either is excellent.

A great SS pre-amp to try is the Jeff Rowland Research Group Capri. Look at Guidocorona's reviews and comments here on A'gon. It unseated his ARC Ref3 and another replaced a Conrad Johnson Premier. In my house, the Continuum integrated unseated my Conrad Johnson CA200. So, you see, despite it's low cost ($2700 without phono-stage and $3055 with) it's in the top echelon.

Dave

Thanks for the informative responses gentlemen. It's a privilege to be amongst a community of human beings in touch with not merely cutting-edge audio engineering but more significantly with cutting-edge science.

"Moreover, the sound of the pieces together seem to approach perfection to a closer degree than other tube and solid state setups we've had."

That's what it's all about. Be careful when you are this close. However, if you are thinking of a change, are you wanting a sharper sound or a softer sound?