Dr. Boogey and Moonlight Tone Stack

[audioguy]

So I built a tone-stack-less Dr. B this week, and wanted to experiment with some single knob tone controls.
I went with the Moonlight (read about it here http://amps.zugster.net/articles/tone-stacks#Moonlight) The high end doesnt seem to be as open as I like... a little muddy.

Any thoughts on how I could open up the high end a bit more?

Thanks,

Audioguy