I have a similar problem, but when combining the head will bounce and then start to creep up until I hit the down on the rocker switch. I have increased the down pressure, the sensitivity is all the way off and now I am oiling the cable to the potentiomiter, but every now and then it still starts to bounce and raise up. I switch it from auto to manual for 10-20 seconds and then it will settle down and be OK for a while. What else should I doIJ Thanks