Lori,
On your spreadsheet, skip a line, and maybe across it write "Switched to Relion Meter" so that later, the higher numbers will make sense. I agree that it appears the other meter has been "low" all along, and you did mention that a couple days ago in another thread. The "conventional" wisdom I have read here is that the difference between the ATrack and a human meter with BG's in the higher numbers is "30 points", but if your experience is 100, that's important.
When you went to the 2nd vet, and they told you "272", that was done by them at the office, right? If so, then I wouldn't say Copper has been in the 300s all along, but definitely higher than we all thought he was.
You stayed with 1.5 tonight? You might want to change the PMPS number you recorded from 241 to 362 if those tests were taken at the same time.
Before we all freak out, how do you feel about poking your finger a couple times? Do it once with each meter and see what the readings are on each? See if your's is off significantly on the two meters.
Carl