What a nice cycle today! I second the suggestion to give a little food when they are antsy before the test. Once Sam has had a little snack, he'll often settle down for me to test, and then I can give him the rest of his food to eat. Hopefully it will work for Jaxa as well.
One note about an earlier post - you said you massage the area after the shot. You may have just meant that you check through the fur area, but I just wanted to make sure: I've read that it's best to not bother the actual injection site as the insulin is fragile. I'm not sure how much of an impact it could really have to move it around, but better safe than sorry.