Tone and Equipment

After many attempts to 'buy' some decent amplified tone, (partially kidding) I'm just starting to appreciate the power of good tight cupping. When I think I have it and then squeeze a little tighter, the tone jumps another notch. I look at my hands on the mc in a mirror and think it's completely closed only to find it's not. I have trouble using the "against my face" technique to close off the top of the harp because I still switch to lip pursing (although I'm staying tongue blocked more and more). Is there going to be any work on this aspect of playing Dave??? Or do I wait until May in San Jose ;-)

And man , I had no idea how much cupping technique affects feedback!!!!

Any ideas out there??