Can you tip the dies forward on a Magnabender so they press down just out at the bending point? That may lessen the flattening tendency of the dies on the second bend. I've also used a tipping wheel in a English wheel to make these. In my case I used a soft urethane lower wheel with a knife edged upper wheel. I've made them freehand with a small, narrow, hand held roller like a miniature heavy duty pizza cutter using a strip of something that lifts the metal off the table surface slightly. That approach takes a steady hand to keep the line straight.
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