Will an Amp change improve my system ?

"I like my current system and wonder if an amp change would improve it significantly ?"

Probably not. If you are using the Schiit front end components and already are using the tube section on your Freya+, adding more tube amp effect or Class-A in lower-power amps won't likely add much to a system you already enjoy that has 140 WPC.

IMHO an amplifier change can really change the system sound. But so can a good preamp. Or a speaker change. Or room treatments. But I don't have any direct experience with any of the components that you currently have, so .... YMMV.

Your system seems already thoughtfully worked through with very good quality components. The Freya+ is an excellent preamp in the kind of system you have, it affords you three different processing modes, two with gain, one with tube gain and tube rolling is very easy if you are inclined to experiment. The Freya+ volume control is very precise. (It is easy to understand why that preamp is so popular.) Your amp is high quality with plenty of headroom. With what you have already, I doubt adding class A amplification or a tube amp will do all that much to improve what you already like in the room you have with the system you have. Pairing a tube preamp with a good quality solid state power amp is an excellent way to get the "tube sound"--the warmth, "airiness" and expanded soundstage everyone using tube gear seeks--while getting the power you need to drive low-sensitivity speakers in the 85dB range. If you want to try some small adjustments, changing out the tubes in the Freya+ would be the place to start.

Amp that will match your speakers will definitely a game changer. For 15 yrs my eggleston Andra were not maximize if I will get powerful amp I get good sound but no musicality I like. Until I found the Tsakadiris apollon monoblock using KT 120 tungsol powerful enough to drive my Andra to give liveness and musicality.it was a perfect match.

Bryston 14b3 or Bryston 4b3 amp.  Use a great tube preamp with the Bryston and you would be surprised at how good it will sound. The crucial choice is the preamp because the Bryson's are pure, neutral power...solid and dependable. In other words, the preamp you chose will determine the quality of your audio output while the Bryston simply delivers it to your speaker choice.