Just installed my 10" S&B today with no heat shield as per your recommendation. Looks good, doesn't "flop" around as much as a smaller filter, seems to rest in there perfectly. It is much closer to the opening for the headlight when the light is out, I am happier about that. My old filter wasn't dirty at all, so I will be a good brother and let my younger sibling have it.
I think I could have even gotten a larger filter in there, but i didn't want to push it. :beer