Link to previous post:
https://www.felinediabetes.com/FDMB/threads/05-11-24-dude-help-one-more-bg-test-before-pmps.289880/
I haven't read far back to previous posts, but it looks like you aren't able to get any tests besides preshots? Lantus dosing is not based on preshots but on nadirs - how low a dose takes the cat. With SLGS, every drop below 90 is a reduction in dose by 0.25U. You hold a dose 7 days (not 3 day) unless a reduction is earned and do a curve to determine if a dose increase is required. In addition to a curve we suggest getting as many spot checks that you can get - say a test at night before bed, or a mid-cycle test in the day when you can etc.
What you are reading about not giving insulin below 200 or giving a token dose for lower preshots is just till a caregiver collects enough data on how the cat responds to insulin. Experienced caregivers can shoot any number over 90 with SLGS. Lantus is very good at giving flat cycles when you shoot low.
Rather than change doses depending on preshots like you have been doing for the last few cycles, you want to stick to a dose (say 0.5U) and see how he does on it.
243 is a safe number to shoot. I suggest you give 0.5U for now. Hard to say what is a good dose for him considering the dose changes and the skips. I will tag
@Wendy&Neko for advice on what would be a good dose to try from tonight.