Nope. Haven't heard the Supratek or BAT. I do own Von Schweikert, and have similar taste in music and desire for a non-forward sound.
You might consider a Lamm LL2 Deluxe. Its sound can be substantially altered by rolling 6922 and 12AU7 tubes.
You might consider a Lamm LL2 Deluxe. Its sound can be substantially altered by rolling 6922 and 12AU7 tubes.