Holly -
I am not an expert in the lift system, but my impression is that you are right on both counts. If you look at the bottom of the support bars (in your photo), you will see that the bottom of the support bar is deformed, wrapped around the torsion bar a bit. This increases the grip of the (flat) support arm on the (round) torsion bar, and is also an indication what I meant by "torque-y".
Bill
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