I want to purchase a silicone band, but I am unsure how the band should be worn to know the proper length (S/M or M/L) to purchase. My wrist measures about 6 3/8” or 163 cm. I’ve tried on both size bands. The S/M fits best on the second last or last hole, but that leaves very little overlap inside (maybe a 1/2”). Could it fall off with a limited amount of overlap? The M/L fits best on 2nd or 3rd hole with about 1 1/2” overlap instead. Should the watch be worn snug or loose? In the photos attached, the blue band is S/M and the stone band is M/L. Which size if best based on my wrist size and avoidance of it falling off?