Tim,
Regarding the A/F chart, above the line is lean, below the line is rich. Looks to me that when your carbs engage the main jets the bike runs a tad rich, then as the throttle opens it heads back to the lean side. I'm thinking down a size on the mains to adjust that 5K dip with a shim to richen the rpm zone where the pilots are working and you should be golden. The carb guru's will know better if this is correct
(I suspect they might offer to skip the shim and increase the pilot instead)
