The only thing you might be able to try is to use a grinder and lengthen the hole that the torsion bar goes through under the trailer. However, that metal is VERY hard to grind, and may not even be enough to provide the extra lift you desire.
It's not too bad to replace torsion bars, and there is a youtube video on how to lift each shell end to replace bars. The only snag I ran into when replacing my torsion bars was that mine had the wrong sized bar. The bigger one wouldn't fit through the hole on the bottom of the shell, so I had to grind the hole larger.
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