I am assuming you are using an AT2 meter? ( Only because you are a vet and all the vets love that meter) however there are a lot of us here, myself included that are using human meter as the Tight Protocol (TR) was written for human meter.
What I noticed looking at your Spread Sheet (SS) , you are switching up the dose back and forth in size and it's hard to know what each dose is doing. Unlike Prozinc, a sliding scale doesn't work with Lantus; since Lantus is a depot insulin, it craves consistency and the dose needs to be held the required amount of time to fill and you would hold that dose according to whether you are going to be following Tight Regulation (TR) or Start Low Go Slow ( SLGS), but of course if Floyd goes below 68 on an AT2 or 50 on a human meter he would earn a reduction of .25 of a unit.
Also, your SS is going backwards from the current day to the past and that will get confusing for peeps trying to see what it is going on. I am glad you shared some the ProZinc history as well.
Night time is when most kitties run lower so please always get a test in at least before you go to bed to see how low he is going. For instance on March 9 th PM cycle he was 242 and you shot 4 units and no more test. The next AM cycle he was 600. He most likely went lower than he is use to going and he bounced the next AM into the 600's. Bouncing is frustrating for sure but all that can be done is to let the bounce clear and it will take up to 3 days or 6 cycles sometimes to clear.
Come on over to the Lantus group and as others said, read over the stickies at the top where you will learn so much on using Lantus. Also, please start posting over there so all the veterans over there can help you with dosing. For now, we need to find a dose to get Floyd on that you will shoot consistently so we can see where he is in terms of dose. We don't want him to run over the best dose with switching around the dose. We recommend changing the dose in increments of .25 of a unit for just that reason. Sometimes too much insulin can look like not enough.
See you over in Lantus!