re: gauge - Thanks for clarifying. I was hoping that wasn't the case, but will sort that out sometime this week.
re: corrector jets - So my understanding is that the larger the jet the leaner the mixture. When I described the issue to the guy at Pierce he said that he doubted it was pressure related, but that the mixture was too lean up top, so suggested I go down a few sizes in the corrector jets. I did that, which made it worse (moved the problem down 1K in the rev range or so). So, at that point I wasn't sure what the problem was, but figured I'd try moving to the larger corrector jets and see if they made a difference. Surprisingly they made it run better. So, now I'm at the point where I doubt it's pressure related because the corrector jets being larger made it run better (one would assume that if it was pressure related they smaller corrector jets would have helped, not made it worse). With that said, I'll still run a longer piece of fuel line and verify the PSI when above 5500, but figure I need to get a WBO2 setup to get to the bottom of this.
re: seconday - never thought to check, but that's a good idea to check and will do that.