I've always thought, in my case, with the my NV that a few more light weight stand-offs would firm the grill up a bit. I need to check but I seem to recall that my ae410 has more stand-offs on it. It would be a drag to dent the grill.
Call Jim Bergantino if you feel you need more screws for your grill. He will probably send you some. My AE112 had some problems with the grill rattling and Jim sent me 2 more screws. The slight difference is that he said that mine had less screws in it already compared to what he was currently shipping.

