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This topic has been beat to death over the years on here. PCV valves are very helpful on street engines to help ventilate the crankcase. PCV valves flow max amounts at low vacuum(wot) conditions. They flow less at closed throttle(high vacuum) conditions....check it out!

https://www.google.com/search?q=pcv+valv...mp;ved=0CCQQsAQ

Me thinks you have the flow backwards, maximum at idle to part throttle, no or almost no flow at WOT that is according to all the vacume gauges I've used over the years



Take a look at the link I posted. I understand vacuum drops under load....however the flow through the valve increases because of spring tension. They do that because,as you know, the engine produces more blow-by under load. I have posted pics of the flow through the valve on numerous occasions, I just don't have them on this pc. The link has many of the same pics.