Holley/Demon Carb stumble

I really think that the POWER VALVE is what fix the stumble not the metering block(calibration is better hands down.)But i thing the power valve was the biggest problem
all along. So i want the demon put back to its before or beginning tune up only with a NOT 4.5 POWER VALVE in it and see what happens.

I have the box the demon carb came in. It says right on the box, that it came with a 6.5 power valve not the 4.5 i put in it.