a213m
You can omit that screw, the board will be held secure with all 8 other screws.
totally right i've done the same thing with my z390 ftw...
EVGA Z390 FTW | 9600K 5.0GHZ 1,25v (auto) | 4x4GB BALLISTIX ELITE 3200 CL16 XMP 1,35v @ 4133 CL19 1,35v | EVGA GTX 1060 6GB SUPERCLOCKED |