Thats a beauty!! wowzers!! freaking pretty machine there buddy, such clean lines, looks a bit like a GT, I love GT bikes I have an old Panterra in the garage none electric such a nice bike to ride although i have abused it a lot over the years it could to with a few bucks spent on it
What controller are you using? I run 50V of lipo on my BMC they run great at that voltage, i am very careful not to over stress the gears though as the std white nylon gears are not so great at power levels over 1KW (neither is the one way bearing) if you know how to treat these motors at the higher voltages they can be reliable.
A tip for that rack of yours though, ditch the quick release bolt, I only carry 8-10lbs in my topeak racks and I have snapped 2 of the bolts dumping my batteries in the road behind me
luckily both times nothing hit them and I just stopped and picked them up and peddled home.
Its a weak point if you look at the design of it :? there is a lot of shear stress placed on the bolt as it sits under tension in the clamp which is a lot bigger than the thread of the bolt, I used a dremmel tool and opened the hole out a little and fitted a big 10mm OD bolt all the way through and then fitted a split pin around that, the fact that the bolt now is twice the size and the load is being placed along its length should stop the failure from ever happening again, however the batteries are still connected by a couple of Anderson connectors so they can disengage if the worse should happen, as much as I love my Lipo pack you dont want 8lbs of batteries swinging about behind you on a wire at 40mph!! much better to dump them in the road than to fetch you off.
thanks for sharing your bike with us and if you want to see the bolt I put in mine to give you an idea I will post em, I can also post you pictures off the original clamp bolt that snapped