Yes, it's a thick wall hose, no collapsing on any part of the hose and connections are tight. The valve has chatter which tells me that it is opening and closing rapidly. At idle, no sound of a whistle, it begins as soon as you put it into drive from park.
Sounds like a mild cam and the vacuum pulses are causing the PCV valve to chatter between high and low flow settings. So it probably is right on the edge all the time.
One suggestion is to the switch to a certain MP PCV valve, which changes from low to high flow at a lower vacuum level. I can never keep track of the MP PN.....