I used to build overclocked gaming computer systems when I was younger. Some chips would not be stable at a certain speed, but by overclocking them slowly over time eventually they would be able to achieve higher speeds. This apparently occurred due to the electric current wearing away the pathways (like a river causing ground erosion) and allowing more current to flow. I wonder if that is what is happening here.
I accidentally overcharged my battery to 56.7v today, this is going to be a tough one to try. I hope I don't have to pedal all the back up the hill if it does not kick on for me. The trick appears to require a load on the motor. If I hold the wheel off the ground it will kick for a second and then stop, but if I am on the bike and it kicks it will stay on as long as I hold the throttle, and after 30-60 seconds of full throttle everything works normally. But if I turn the unit off and back on I again have to wait for the kick and then hold the throttle before it will work normally again. Funny huh
Edit - 56.7v worked no problem, only took about 20 seconds to get it to kick. I guess I should try 57v