Offshores are very clunky, and you need to wear it tight on the wrist. Otherwise, the watch will noticably wobble back and forth on your wrist and be an annoyance.
Plus, you have the AP deployant which really isn't that comfortable so wearing it loose will make things worse. You'll find the AP deployant rubbing on the bottomside of your wrist.
So in summary, for your Offshore, wear it tight
Also, another suggestion for those who use a short strap on an Offshore - if the watch is still uncomfortable, try swapping the strap to the opposite side so the deployant opens the other way. You may find it more comfortable that way.
Cheers,
Anthony