....In the meantime, I have parts on the way to steal Litz ideas.
I hope you get the tuning "tuned in" and all the little bugs taken care of.
As for the mod your going to do to the fog light trim/grills, I thought I'd take a few pics of the back of the grill, after attached, but couldn't just pop them out without taking the bumper off again, so I opened the bottom corner of the under-bumper-covers. Thought I could get to them easily enough to remove the fog trims without removing the bumper, but found that the access was just too constricting, and only useful to change the bulbs, but not in removing the fog light trim piece itself. But I did get a couple pics to show you what I ended up doing.
Cutting the OEM "grill" out is just a matter of removing the honeycombs, but leaving the 1/2 inch inner lip--doesn't have to be a perfect cut, as you can sand down the rough edges. Then I traced out the pattern and cut the grill material about a 1/2 inch or less wider for the attachment points. Attached with small zip ties, and just heated up a small hole punch to burn the holes for the zip ties instead of drilling. You can see the zip ties from the back, but they don't show through the front of the grill at all.