I have always cringed at those long slide outs.
Hate to say it, but I think the root cause of your slide out problems is the size of your slide out. It seems to me to be an awfully long slide out to be using that kind of system, and its my guess that it will never work correctly.
Good luck and I hope the best for you and others with this problem.
The only thing that works on a RV is the owner...