I'm having a bit of trouble with my garage door, first of all the spring broke (which is now replaced) but as I've adjusted the sensitivity and other screw controls it no longer opens to the desired spot. For example, when the door is not connected to the lifting mechanism it seems to work properly but when I attach the door it seems to have a mind of it's own and doesn't open and close properly. Is there something simple with the adjustments that I can do to rectify the problem?