Following up! Phil (the Canadian distributor) arranged for my replacement needlewheel to be shipped up via Roger as he was out of stock up here. Many thanks to both Phil and Roger for outstanding customer service!
I popped in the replacement a couple of days ago, and the skimmer is now running properly (much quieter and correct water flow). The pump is not silent,but its not much louder than my Tunze return pump, so I'm quite happy now. The cooling fans on my LEDs are louder actually. I also cut down the output pipe by about an inch so that its only about an inch above my sump water level. I'm now running the air about half open (hard to tell, just an approximation). Bottom line, I now have good control over how wet or dry I want to run it. Pulling thick junk out now very nicely!
With the water flow corrected, i am now able to run media in the post-skim sock. All in all, I'm quite liking this skimmer!