Just installed the new display and 35A controller on my Rad Min 4.  I noticed in the settings one ADDITIONAL setting, C15, which is factory set at 6 (it can be set to either 4, 5 or 6).  I got my controller from Electro Bike World but so far no word from them on this setting.  Anybody have an idea as to what this MYSTERY setting does?  It is not mentioned in any blog posts, videos or the mfg manual on the controller so I don't have a clue.