Problem with Mighty Demon 750

I've got it to where it's not puking fuel now. I cleaned the **** out of it at work yesterday. I've adjusted all four corner screws. It's idling pretty good now. My vac IN GEAR bounces between 12 and 8 lbs. I've still got the 4.5 PV in. Not sure if I should throw the 6.5 in or not with the vac reading like that.