Ayon or Pass

A choice between Ayon Auris II Signature and Pass XP-22.

System:

Ayon S10 II Signature

Pass X260.8

Totem Forest Signatures

REL S/510 (pr)

Townshend F1 Fractal speaker cables

Townshend  F1 Fractal interconnects

Untreated room 13x19 - (known issue but can't be addressed at this time)

I ordered an Ayon Auris II Signature model. Unbeknownst to me, I received a standard model and only realized it recently. The dealer was extremely apologetic and will be correcting it after the Holiday. 

This creates an opportunity, because initially was slightly disappointed. The Ayon/Pass combo definitely improved the dynamics and soundstage vs the ModWright KWH225i, but of course I was expecting more/different. 

Soundstage larger more dense but not detailed and dynamics better but not by much. Vocals are wonderful.

Because of the mix up, I have an opportunity to change to a different preamp. Will the Signature model help in those areas or should I try the Pass XP-22. Will the ss pre and "Pass synergy" give me more of what I am looking for in soundstage and dynamics. Will I lose the mids and vocals.

note: @150-175 hrs on amps/pre may not be enough to fully allow for changes to be complete.

Knowing that the number of people that have actually listened to or owned both is extremely small (if not non-existent), what could be the main sonic differences, such as, detail within soundstage and dynamics. Also, any pros/cons of each.

Info gathering to assist in final decision.

Would like to keep discussion on these two preamps as they are my options.

Thanks 

Scott