QuickFuel 880 Surging/Missing At Wide Open Throttle

There ya go.... progress! 2nd time is a charm. I have to wonder if the slight miss/surge at 3000/WOT is the secondaries opening... which I assume meams you had this miss/surge while at WOT and accelerating through 3000 RPM. You could block the secondaries closed and try again; if the miss/surge is gone, then you can focus on the secondary transition. If not, then my next thought would be the variable air restrictions into the main emulsion tubes in the primaries.

Following the Holley recommendation of 1 jet size reduction for each 2000' of altitude, it seems like you are about right in the jets now. Without plug reading (getting harder to do well IMHO with the modern pump fuels) or a wideband sensor in the exhaust, you'd need to do timed runs in consistent temp and humidity conditions on the exact same course (called a 'drag strip' IIRC) to look for best times. Since you have gone from waay rich to OK, I personally would put in a sensor and use that, or leave the primaries alone and work on other issues.

You're just scratching the surface of tuning this Quick Fuel carb, ya know LOL