Speed and acceleration are the enemy of range. Wind resistance over 20mph becomes a major factor.
Large, heavy, DD motor in a front fork is just a very bad idea. Front fork snaps off at speed serious injury is likely.
700C wheel is like putting motor into a high gear, all the time. Gain speed, lose torque. Small wheel has opposite effect. If only there was a small, lightweight motor with 2-speed, internal gearing change. There was, I looked at it hard, but it was poorly engineered and just was not reliable. Some folks find a 40-50% failure rate acceptable, and argued hard for it, but they were paid shills and other, reputable users told the truth. That POS is no longer sold, even by the shadiest of vendors.
You must decide if you want a light motorcycle or an improved bike. My decision prioritized reliability, range, no drag even with dead battery. Speed and performance were secondary.
To describe my build - Walmart GMC Denali, 700c, STEEL forks, inexpensive. Many thousands of road miles before motor, works fine. Old-guy seat and handlebars upside down. Oversize tires also added. Stock with 48-13 max gearing. I need to peddle at least some, long story, but mandatory. Faster speeds you need some extreme gearing to be able to pedal effectively, especially with a slow cadence.
Motor - MXUS XF07 350W, geared, front hub. on 36V, 18.5mph max, all-day speed. Climbing ability minimal, as is acceleration, but those are what I use the pedals for. 36V, 15AH battery gives range of 30 miles with minimal pedaling - Startup and acceleration, when maximum range-sucking power is needed. Motor has outlasted one bike and one battery, on second of each. Weight around 6 pounds. Effect on dropouts undetectable on examination.
This november will be 6 years of daily use as only transport. Approx 15,000 miles, not problem one. No maintenance whatsoever, never cracked the case, frequent torrential downpours, no water issues, other than a dead throttle twice until I blew the water out.
I did not pick this motor at random. I have read every problem report posted here and several other sites for the last 8 or more years. Go ahead, look, see if you find one on this motor, or similar models. Part of that is that it just ain't a hot-rod motor. I don't need to get there fast, I just need to get there.
The Mac is a good unit, and Paul a reputable dealer, but you will really need to go easy on the throttle to get the range you want, and most people just will not do that. Zoom, Zoom, if it is there, you will use it. I had to have the range and did not have to have the speed, so, easy decision.