Vacuum this low normal?

Well, higher compression= better vacuum, Check. 20* timing at idle, more vacuum, Check. Carb set to Highest vacuum reading, Check. Something don't seem right here. It should have more, but I guess its as good as it gets. Are you sure the gauge is right? No leaks anywhere?

One more thing that pops into mind, where are you taking the reading from? Intake or carb? If from carb, are you sure its not a "ported" vacuum port? Just asking.