In answer to your questions:
On all but the 30% grade it was light pedaling. It could probably make it up a 15% with no pedaling. I am very out of shape so the moderate pedaling on the 30% got me breathing hard but I was riding with one hand, sitting down so couldn't have been putting out more than 100 watts. I weight about 150 lbs, btw.
The voltage was 36V and was not the original battery, it was our LiPoly pack good for 20A continuous.
The controller is a Lyen 6 FET with 3077 mosfets.
The front sprocket was actually a 52 tooth (not stock). It has since been changed to 42 tooth which will give it more torque. I believe the rear is a 22 tooth. The top speed is still about 20mph.
The motor was barely warm after the hills shown. The day before I had it up to 800 watts and the motor got hot. So 500 to 600W is the sweet spot.
It now has some serious knobby tires on it, so hope to get some off road shots climbing Mount Tam soon.
I will be offering this model for sale sometime this summer and am currently accepting preliminary orders.
-Terry