Knights19

Ah I see. I was focusing on the second half of your problem rather than the first. I get some hesitation at lower speeds which I think are EGR related and did get some limp home mode activation before I change the valve. I take it you have a MIL on with the P0405?

I was told you couldn't re-map out an EGR delete on the later all electric EGRs.

I'm interested in your findings on this. I was getting P0405 as well as others related to flow. I stripped the EGR and cleaned it out to no avail so replaced the EGR. Now I only get the 0405. 

http://www.obd-codes.com/p0405

Gives a good diagnosis procedure which I'm going to try.

I also think the feedback wire should only see the return voltage through the sensor (as you suggest), so would be a variable voltage reading (or a simple 0-5v) depending on the valve position.