Is the inner telescoping leg fully raised? You have limited travel of the outer driven leg, but you have much more travel by pulling the pin and telescoping the inner leg.
I'm not sure what you mean with the Strong-arms, except that they may not allow the inner leg to telescope as it should. To which I would suspect they were not installed correctly.
2006 F250 Diesel
2011 Keystone Cougar 278RKSWE Fiver