Well,,, I got a little frustrated last week with swapping components,,,and how sloppy my board has gotten,,,,so I decided to lace up a "prototyping board" for the cathode leads that I wired in on Saturday..
I mounted a small section of board to the top side of my chassis, with some of the turrets laced together to give me access to each component in it's own individual path....(initially created a wicked ground loop, but figured it out quick and got on with it)
I ran all 4 stages cathode wires to the separated paths and also used small trim pots for the last 2 stages to try to "dial in" the correct level of gain at each stage.....(if I had more trim pots, I would have used them for all 4 stages)
My intent is to use this board as a "prototyping" board during the "design" stage, before making a final board layout,,,,and then being able to remove this and take it to my next project,,,,(at which time I will put trim pots in all 4 locations)
I also removed the "balance mod", in an attempt to simplify and focus on getting the base sound zero'd in...
I went back and put the paralled connections back on V1 (because that just sounds the best to me) and wound up with a 68K plate and 680R cathode resistor values (taken from some things I had read about an input stage on a popular boutique amp,,,thanks again Jojo)....basically-reduced values help to lower the noise floor in that 1st stage
I took the 12A
U7 out of V2, and put back a AX7 with a 150K plate and 3.9K cath. with 2.2uf bypass cap (now 1 unused triode,,,,hmmmm?)
I also
completely removed the tonestack which obviously helped "push" the signal along!
I was able to dial in a great combination of values at all stages, and now feel closer than ever to having this amp completed

I changed the value of the 3rd stage cath. resistor to 3.9K (from 10K), and raised the 4th stage value from 33K to 47K
I removed the bypass cap from the 3rd stage, which was a HUGE source of noise,,,and still have more than enough overall OD to keep me happy

I've also continued to experiment with plate resistor values on the output tubes (with 470R providing a more open sound to my ears, compared to stock 1K), and conjuntive filter values (with no filter still being my favorite) (I'm not done)
I'll stop back and post the schematic when I get it drawn up.....to my ears,
this is the most professional sounding setup I've tried so far, with much less noise, and a much purer sounding tone----less buzzsaw 
The main thing I have continued to focus on is the effect of ultimate sustain that blooms into harmonic feedback, and have done everything in my power to enhance that during this process.....if something takes away from that quality---it gets removed,,,and if something enhances it, it gets pushed to the highest possible degree to see how far I can take it, without creating excessive noise................
that is one big 'ole tug-o-war!**EDITED- added pic of head cabinet I built with my new dovetail capabilities