Hi Michael,
Nice report mate. You're every bit the photon junkie alright,
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I too have struggled with M83, having only twice managed a clear view of its bar & arms. Have you managed to pin M33? It is magnificent in an RFT! & twice the diameter of the full Moon.
Here are a couple of 12V hair dryers. Just be mindful that they are power hungry buggers, and might be best served with their own car battery power supply, not your car's, and a "booster pack" will shut down when the power gets too low. I've got one, and only keep it as a back up incase I forget a dew cable or two. They do a nice job though.