Two hours and 1/2 gallon of fuel and .... no improvement

I again cleaned filters, checked for air leaks, and cleaned the carb.

I took the pressure relief valve out in 1/3 turn increments, and am now about five turns out from factory setting. The high speed is out four turns and is becoming non responsive. The low is now in to about a 1/4 turn, and the midrange is rich enough that you must leave glow heat on to transition, and even then it is iffy.

I replaced the plugs. Fuel is new, Wildcat, but I also tried Morgan just for luck.

Seems to me the pressure relief feature is not working.