I like looking at ES. I want to know what the extremes are. SD is good, but it doesn't tell the whole story.
Looking at your data you posted, Cleric mentioned what I saw. Your overall ES is 44. But shots 4-10 were only 22 fps ES, which is great. But the more you shoot, the higher your ES will go. I put 39 rounds down my 6.5x47 and got 29 ES when I was zeroing at 100, and shot it all the way out to 800 yards, while getting dope. That's still really good for 39 rounds. There were a few that caused the ES to raise. Most were within 5-10 fps of average.
If you have a large sample size (lots of shots), and most are close to the average with a few off, your ES may be high, but have a low SD. If you have a large sample size, with the same ES, but the shots are all over the place, your SD will increase, because the shots have a larger spread.