I thought the same thing and made the same mistake on a Uniden PC76. I wish the tech had told me to keep out of the radio instead of encouraging me to turn VR4 to make it louder.
He did mention though that radio in video was a Uniden 78 and he really isnt impressed with Cobra since Uniden no longer makes their board, I have a Uniden 78ltw that the modulation level is really loud with amc turned up all the way ( have since turned it back ) but the newer 29's I have ( chrome LTD and Lx ) don't seem to be as loud, wish he would of included newer 29LTD in video and see if spectrum analyzer would of looked the same.
I guess the moral of the story is if you want modulation set to 100% have it done by qualified tech or just settle for stock setting which Im guessing is probably 80 - 85% which should be adequate.
That's too hard for old guys like me to read. From responses to it, I'm guessing I would have liked to read it. Any chance you could make the print larger next time?