NAZA does not have pass-thru facility, it did not come in until the more proffesional units, A2 for example.
As Alex has said you need to get the gear working with a pure RX channel so you can see what end limit figures are required to get it working correctly.
Look out for a movement that only goes on way 0 to 1000 or 0 to -1000 not 1000 to -1000. If this is the case you may need to reverse the TX channel.
in the Assistant software X1 has a ‘speed adjust’ control as it is meant for gimbal pitch adjustment. You may need to set this at fast response speed for your landing gear.
Let us know how you get on, it’s an interesting problem