Jeff... Ian would be a great source for the halyard too!
I personally think 6mm is a bit thick. Tripp would freak out if you put that on his boat. He uses the euro style where the halyard is almost entirely dyneema, maybe only 10-15' is FSE Racing Sheet.
Ian, I know Robbie Daniel's uses stripped dinghy control as well. He said that if you strip it the polyester cover doesn't cause burn holes. I tried it years ago and I got burn holes from it. The blended dyneema of racing sheet doesn't get nearly as hot from friction.
Todd, I generally agree on the size... If I was crewing I would drop down to 5mm and probably have the straight dyneema core on the retrieval end. But I drive, and the crew gets what the crew wants, cause life works out better that way.
