Hi V,
The way I setup the UP valves is: disconnect the cylinders from the doors, activate the valve and, as the gear goes up, watch when the door cylinders start to retract and adjust the needle valves to get the timing correct. After you have it setup that when the gear is retracted, then the doors close. Hook up the cylinders to the door and fine tune the timing.
I've found that the settings of UP valves, as setup at the factory, are usually pretty close.
BRG,
Jon