Wanted to give you all an update and let you know that Barry has been doing really well, his numbers are staying quite steady in the low range!! He's happy and acting like a normal cat his age - meaning he naps, plays with the other cats if they let him, runs around, plays with toys and loves to cuddle.
I picked up our brand new AlphaTrak meter on the 26th and returned the one they had loaned to us, that evening Barry's reading was pretty low, a 1.9, which had me concerned but he seemed normal. The next day when I tested I realized that I hadn't coded the new machine to the number on the container of test strips, so I fixed that and the test came back as 7.7! I was worried that we had made the same mistake with the loaner meter, especially because we'd been using it with human strips, but when I tested him in the afternoon he was at 3.6 and then in the evening he was at 2.7, so back to "normal", at least for him. Not sure what would've caused the spike to 7.7, it was about 3 hours after he ate, if that could have anything to do with it. Speaking of food, we've been feeding him mainly medium carb wet food, such as the Fancy Feast "Grilled"; Friskies Chef's Dinner and Turkey & Giblets; and the PC brand in the Beef, Turkey & Giblets and Chicken Dinner flavours. I found a helpful article on calculating carb percentages in wet food and if I did the math correctly all of those foods are in the 10.5% - 11.5% range. We occasionally feed him the Fancy Feast Pate but they're lower carb (4.5% by my math) and his BG tends to be a bit lower after feeding him those. I've done some reading here in the forum and it seems he's one of those cats that needs a bit of carbs to stay level. I've made a point of reading labels before buying any new wet food and I try to make sure that the only grain ingredient is rice, I've avoided anything which contains wheat gluten, soy flour, corn meal, etc. because they all seem to be high carb and I don't want to risk getting his numbers up too high. Also, I don't test him before breakfast most mornings because my husband feeds him when he gets up for work. Oftentimes I test when there's been a long interval since his last meal, up to 6 or 7 hours if possible, but I've also tested at 3 or 4 hours to make sure he's not riding a roller coaster of BG.
If there's anything you think I should change or any other advice I would be glad to hear it! Thanks again for all of your help!