I had a similar issue and found that a quarter turn (up or down) to the torsion bar adjustments did the trick. Watch very closely when you raise the roof and see if it tracks a little off as it is raising. If it is hard to lift then tighten the torsion on the low side a quarter turn and raise it again, repeat till it is level. If it is easy to raise and slams at the top, then loosen the torsion bar on the high side.
You can only adjust the torsion springs on the unit when it is up and the tension is less (not quite off). You have 4 torsion bars on each roof and they need to be balanced. Do not crank on only one on each side, have to do both. A visual check should show that all are about the same distance in, if not try to make them so. It is not rocket science but can be physically challenging, especially if you have a bad back like me. Have someone help you do the lifting, a balance may take 6 or more raisings and lowerings.
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