Breather to PCV

Yes !
I have been experimenting w/ these set ups for a while now , w/ a vacuum gauge from the valve cover to inside the car. I cant figure out for the life of me , why my engine runs like its got a vacuum leak when the air breather is hooked to a valve cover breather ,when I`m running the pvc ports on the back of my throttle body thru an oil catch can(experiment
no oil has shown up). The other side , I`ve tried the system like in the drawings RRR and 512 posted , and because st hemi`s came that way from the factory.
I currently have a screwin oil cap on one side , pcv to the throttle body on the other, and have the best crankcase vacuum that way , 5'' , up to about 4200, it should drop off at wide open throttle but I havent nailed it and tried to watch the gauge at the same time yet.
The crankcase vacuum is steady , and darn sure has helped stop my oil leaks , when I take the screw on cap off while idleing u can hear it suck in very loud and feel the pull on the cap as I remove it .
Just wondering what it will do when held at wot , like on the strip , that is where the breathe hooked up would work it seems . But cant get past the vacuum leak it has when hooked up that way .-------------------thots and comments welcome -------------
Wow 5 inches of crankcase vacuum?
Are those inches of water or inches of mercury?
From what point on the engine are you pulling that measurement from?