Oksana
I've had a chance to look at his spreadsheet since I fixed it for you and you added numbers. I am wondering if he is not overdosed?
He has gotten some blue numbers at 2.5u and then you see these red and black numbers. That indicates to me that he is going lower at some place in the cycle and then his liver gets panicky and releases hormones and more sugar to bring his BG back up (because it has become accustomed to higher numbers). We call this "bouncing".
It's hard to discover the low numbers if you aren't able to test a bit more. Once he gets into a lower number, he can then have six cycles afterwards of high numbers from bouncing.
It takes a test at every preshot and then random tests during the cycles to discover where he might be going lower.
Also keep in mind that if you change food from the canned and dry foods you are giving him now, which are higher carb, his insulin needs will also be less. I would make any food changes very slowly but I'd also try to get a few more tests each cycle, and definitely a preshot every single cycle, so you can see if he needs less insulin.