I suggested a cover under the panel and vents to allow cooling air to flow. That would be fairly easy to arrange. (But I was thinking of how the vents would work when you are moving, not stopped.)
Perhaps instead just use a gentle fairing that doesn't have to extend too far forward - make up a mock-up and tuft test to see if it retains attached flow. You could probably use dense mesh for this fairing to aid panel cooling.
Before making any changes to the rear end caps, I'd also tuft test these to see if they're working.
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