Your meter should record the numbers for you in it's memory, so even if you forget to put it into your spreadsheet, you can go back and see what it was.
Without the data for the last couple of days, it's impossible to really know what's going on, but I see a couple things
Lantus craves consistency.....You're changing his dose too often. Lantus dosing is based on how low it takes them, not the Pre-shot numbers and then it takes at least 6 cycles for the depot to stabilize and really see what it's doing.
You need to hold the dose for at least those 6 cycles and get both Pre-shot tests (AMPS and PMPS) as well as (IF possible) a mid-cycle test on the AM cycle and at least a "before bed" test on the PM cycle (more if you can, especially if you can't get mid-cycles during the day due to work)
PM tests are even more important since most cats do go lower at night, so getting at least a "before bed" test will help let us know what's going on, as well as keeping him safe. If he's dropping too much or too quickly, you may need to set an alarm to wake up and test again
Next, I can't really figure out what your "Remarks" mean, but it's important to get the shots in as close to every 12 hours as possible. If you shoot an hour late one time, you should shoot the next dose an hour late too. You can work your way back to your chosen shot times by moving it back 15 minutes per cycle or 30 minutes per day.