Whooshing sound in water supply lines in my house
Have you considered the possibility that the main water shutoff valve is the culprit here?   It may appear to work fine, but perhaps it's allowing air to enter the pipes?  Maybe the valve itself is faulty, or the installation of the valve is faulty.    

From what you've written, the only difference is the new main water shutoff valve. 
 It seems like it's the culprit.  If you didn't have air getting in your lines before, then it seems likely the new valve is the issue.  Replace it.