It is helpful to put notes in the comments section on your SS. For example, noting that you skipped the shot in order to get back on schedule is very helpful to those of us who routinely look at everyone's SS. (It also means you don't have to keep re-explaining!)
Let me see if I can help to clarify about shot times. Even when you skip a shot, the time you would have shot is, as Marje noted, your AMPS -- pre-shot # (vs AMBG - blood glucose #). (I think Marje made a typo, though.) Even if you shoot early or late, whenever you shoot or would shoot, that is the the time you base the rest of the cycle on. If your normal shot time is 7:00 and you oversleep and don't shoot until 9:00, 9:00 is your pre-shot time. If you move the time back to 8:30 at the next shot time in order to get back on schedule, 8:30 is your pre-shot time and your +1 would be at 9:30.
I hope that helps!