A healthy engine will produce about 20 inches of vacuum at sea level, which you are not, so those numbers you're getting are not that far out of the ballpark. You need to get with someone familiar with setting the carburetor up for altitude, plus it looks like it sat for a year or so before you put it back into service. Not good. I'll bet a large lunch at a drive up window a carb rebuild/modification and rebush the primary shafts will solve most of your problems.
