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The bed should be out when you try the screws, not in. There should not be downward weight on the innermost portion of the rails when you remove the screws.
Based solely on the pictures you posted before, I would do the washers. It appears the bending of the rails has begun on your trailer.
I can only venture a guess on the other parts. I would not want anything that is not purely stable under it while moving. I know both of my slides moved smothly when operating properly. No side to side movement that I have ever noticed. They do tend to droop a little near the end of the run out, and snug back up at the very end.
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