A couple of things to keep in mind about bounces...
First, bounces are normal. They annoy us to no end but the reality is that it's a normal phenomenon. If you are like most of us, you were unaware for some time that Hogan was developing diabetes. His body have become used to spending time in higher numbers. As a result, anything that is in the normal range is treated like it's dangerous and his liver and pancreas panic.
Bounces don't just occur because your kitty drops into green numbers. A drop into low numbers can trigger a bounce. However, remember, Hogan isn't reading the meter. Looking at those first couple of 400s that are on your spreadsheet, Hogan's body may consider a 250 a "low" number. So, any number that your kitty isn't used to having seen in a while may trigger a bounce. So, both low numbers and numbers that are lower than what your cat is used to can both trigger a bounce. A bounce may also occur if there's a fast drop in numbers. So the drop from 506 to 254 is likely to have caused some bouncing.
Linda is correct. Getting a cat into routinely better numbers doesn't happen overnight. Hogan was diagnosed less than 2 weeks ago. Please don't make yourself crazy or depressed or disappointed that Hogan isn't tightly regulated in record time. We all want that for our own cats and for everyone else's cats. I can't tell you the number of times I felt like I was doing something wrong because Gabby wasn't in remission. The best bit of information I can share with you is that you are not in control of this sugar dance. Hogan is in control and all you can do is follow his lead.