Seems like you have it working fine on the bench, then you install it with a ton of weight on nose and it fails after a couple of turns.
I was hoping to get Down and locked to solve it with a electric jack screw of some sort
maybe having a look at Skymasters setup will help.
could just be some shotty cylinders. they are special made for this app. cant sustitute any other ones, at least for the one on the strut.
scott