You want to stay as close to 12/12 as possible. You could shoot 30 minutes early each cycle until you are back on schedule.
What kind of numbers are you getting? I didn't see a ss link. If your numbers are lower I would reduce the dose a little, an early shot is like a dose increase.
You are welcome to come over and join us in the PZI Insulin Support group. Everyone there uses the same insulin as you do.