1. I know I could feed back more highs. 2. Does not liking presence mean *the same thing* as not liking too much of the effect of the speaker's rise in impedance with frequency? (This could be reduced by driving a more resistive load (or an entirely resistive load, and taking the output from a "transformer out" or Fender's "Line/Recording" jack, which I never tried.) 3. Do those infamous 220K local negative feedback resistors over the 6L6s in the AB165 address *this exact issue*, or something else? Anything else to learn? Thank you.