I originally used the 46 tooth paper weight sprocket. I just installed the 42 tooth Luna sprocket before taking these pictures and it made a huge difference. I hit 32mph using the throttle only and 40 mph pedal assisted (both on fairly flat ground). The new gearing is perfect now. I'll try to get it out to do hill climb testing before the new battery so I can get an idea of the difference the battery only will make.
There is absolutely no need to run two motor unless you are carrying heavy load.
If you can reduce the weight of that extra motor, it would make it very bicycle-like. I imagine, it would be terrific to ride as well.