Vfet / SIT Amplifiers

I have a FW SIT-3 amp, which I really like. It has plenty of power for my Horning Eufrodite Elipse Speakers. They have 98db efficency with a 4 ohm flat load, which is in the SIT-3 sweet zone.
The sound is detailed, smooth, airy, with beautiful tonal colors and has no electronic signature whatsoever.
I also run 300b mono's, which have a little more texture but, the FW comes very close.
It will be a classic in years to come!

You guys are making me jealous I can't get more out of the SIT-3 in my system!

My speakers are 95db efficient and are 8 ohms. I tried dropping resistors in parallel to reduce the impedance down to 4 ohms but honestly didn't notice much of a difference.

The main issue I'm having is that I listen at low to modest volume most of the time and I can't get enough out of the SIT-3 at low volumes.  It sings at higher volumes but usually I don't want to listen that loud. 

This might be an issue with my preamp's gain, which is only 10.3dB.  Combined with the SIT-3's low gain, maybe this is a recipe for failure.  I haven't tried it with another preamp yet.

@snopro , I share the same experience.  "Detailed, smooth, airy" is how SIT-3 sounds to me too, with  most emphasis on "airy". The "depth" of its sound image was most noticeable to me.

@zm , the preamp could be the culprit. I have not tried anything else other than the Yamaha C-1, but I probably should, to see how much influence the vfet preamp has on the "SIT-3 sound".

I have a SIT-3, which is paired with a Supratek pre and Klipsch Forte III speakers. The Supratek has high gain, which I dial back about 40% via the gain pot and still have plenty of drive and wonderful sound. 

I mostly listen at reasonable volumes (70 db to 80 db range) and find the music doesn't have to be loud to sound good. 

I also have a Rogers EHF 200 Mk. 2 integrated, it has 5 x the power,  more body--and also sounds awesome--but can't match the finesse and intimacy of the SIT-3/Supratek combo. 

Which is "better" would be a matter of a coin toss.