It's hard to give advice because the best position depends on your body position and hand position. One thing I will say is that you'll go crazy if your lights aren't securely fastened. I'd drill a hole for each light through the swinggrip and bolt them on. Make sure you can adjust each light up and down and side to side, that'll drive you crazy too.
Are those the chrome optronics housings? How much do they weigh? Are they metal or coated plastic?
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