Yes, I would both raise it up and make the side/top transition rounded. Hard side/top corners encourage vortex formation (energy-sucking vampire vortices).
Since you don't have instrumentation, I don't think there's an easy way for you to test it. (Though I'd recommend getting an MPGuino anyway, for feedback while driving.)
Coast-down testing is another method, but a lot of members have found it quite difficult to get repeatable, quality measurements.
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