Current production 6SN7s are not nice compared to NOS. NOS 6SN7GTs are much better sounding to my ears than NOS 6SN7GTBs. Of the latter, there are 3 brands that aren't that bad: Tung-Sol, which are dry and detailed, Sylvania, which are more colored, but not overly so, and Raytheon, which are less colored than the Sylvanias.
You say you find the 12SN7s "too polite". Both the 6SN7 and 12SN7 are generally polite tubes in that they substitute refinement for SLAM. I'm not sure there are any 6SN7s that fit in the "slammer".
Maybe you got the wrong type preamp. I find 6922 preamps to be aggressive and rough.
Finally 6SN7GTs are not cheap. B's cost less, but are still in the $30-40/tube range for a decent used one.