I'm trying to visualize this so I can think about the geometry, but I don't know what you mean by this:
"pulled the torsion bar out a bit from the lift arm"
I can't see why that would make the front go up, unless we are using the word "out" differently from each other. Do you mean you pulled up on the shell so the distance between the bottom of the top shell and the point where the torsion bars go under the trailer is greater?
If that is what you did, I would expect the latches to move forward.
Also, I am pretty sure there are 2 sets of seals at the top shell/ bottom shell interface. You are probably seeing a wear mark from the 2nd set of seals. 4-5" is about how far apart they are IFRC. Maybe your front shell was tilted so much the aft set of seals did not touch enough to rub.
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