Piego P-10 or big Thiels?

Considering upgrade from Thiel 2 2 to bigger Thiels (6 or 7.2) or perhaps a different route to the Piego P-10.

Any advice on speaker selection?

I like the Thiel sound a lot, but find this system to be a bit bright on sibilants like Holly Cole Trio "I Can See Clearly Now...", and less detailed than other kilobuck speakers. Sometimes - esp. on upper piano - brightness approaches a glare. Wife and I are not satisfied with B&W sound or MLogan/Maggie space requirements.

Gear is:
AudioAlchemy DDS-Pro
Wireworld Gold Eclipse balanced
AA DTI-Pro
silver I2S
AA DDEv3
PAD Colossus I/C

BAT VK-3i,
ProSilway II balanced I/C

BAT VK-500,
PAD Colossus speaker wire

Thiel 2 2

and preamp to Velodyne F-1500R

I'll eventually upgrade digital gear to Wadia 861 and run it straight into the amp.

Room is medium size with vaulted high ceiling and open to other rooms.

Music preference is no country, limited opera. All CD.