Is the Uniden set as a west limit at 5400 that is editable? If not simply slide your
actuator deeper or shallower in it's mount. If you can change the 5400 I would do so providing your actuator has sufficient travel available.
Sounds like you do not need the
GBox. It is used to position the dish and takes input from the coax. Usually connected to a DVB MPEG2 receiver. It then converts that signal and sends it out the little wires that drive the actuator.