I hardwired my radar detector today.
Fuse 13 was the only empty one I could find on the interior fuse box that was switched for "On".
I couldn't find any other blanks for ACC-On. All the other blanks I tested were powered at all times. (Admittedly, I tried to check them all, but it is...
I'm with you -- I didn't find any looseness in the hatch lid when closed. But the electrical tape provided a very notable improvement. I'm going to do some looking for any adjustments in the catch or the latch mechanism. Hopefully, I don't have to pull too much apart to get to it.