OK, could be a food spike, or it could have been a bad strip before, but I think you're definitely good to shoot something. Do whatever you are comfortable. I'm really hesitant to suggest a specific dose due to my personal lack of experience with this insulin, but I would suggest a reduced dose here, just to be on the safe side.
Sorry I can't offer really specific suggestions. Maybe later when there are some prozinc folks around you can discuss some general guidelines, what dose to shoot for what numbers? As you can see, sometimes the boards are lightly trafficked.