I was out on the Jet (home tuned all 225 with MB reed valve) on Friday, 97 miles 2 up around Norfolk with temperatures in the 70's, most of it at 55 mph (on the Garmin) but pushed it up to 64.9 just to see what it would do then throttled back to 60 for several miles. Seemed as happy as larry until the stator packed up in Diss, 8 miles from home
More development work is needed on the set up but it has bags of torgue in the mid range and is amazingly flexible. Maybe something similar is possible with an iron barrel?
PS, Have you got a phone number for West Coast Windings mate
Colin