Hi All-- I'm eager to increase the top speed of my Radrunner 2, but the popular speed hack posted on YouTube -- about covering the speed regulator contact with electrical tape -- isn't working for me. The battery power still seems to be capped at around 20 mph. Any ideas what might be going on here? Maybe this particular speed hack only works with earlier models of the bike? I purchase my Radrunner 2 last month, so maybe Rad has implemented a workaround?