If you're not using the same equipment that I am, I won't be able to help you confirm or deny your set up and calibration is correct as I have no idea what you're actually using and whether or not it was manufactured like the Sonnax machine. So I'll have to assume your set up and calibration is correct but generally, I don't like making assumptions like that.
That said, if you're getting between 15-20 inch Hg in each valve train and 22-25 Hg when testing things like bore plugs and such, with the caveat that your equipment is well-made, set up and calibrated correctly, you should be fine.
Lastly - Quote my post if you want me to respond quickly...Otherwise, you likely won't see me reply for a day or so unless I happen to see you replied to this thread.