I have a problem with my Activitybot. I had taken the wheel encoders off (note I do not have the AB360) and it worked fine for awhile, but now one wheel seems to be going slower than the other. Does anybody have any thoughts about how to fix this? I've tried increasing the wheel speed for the wheel that was going slower, but somehow it still won't go any faster. So, can somebody help me? I appreciate any help you can give me.