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At the rear, maybe lower the leading edge of the Coroplast and attach it flush with the bottom or the cross-member with all the holes in it? Put zip ties through those holes?
Around the muffler, use aluminum window screen to smooth the air flow, yet still let the muffler heat out and "breathe?" That way, muffler does not over-heat the space around it.
At the front, make a curved air dam out of that lawn edging stuff, which the tucks into the lower trailing edge of the bumper cover? Maybe this would shed some of the stagnant air more gently to the sides.
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