It's probably worth taking Sammy into the vet so see if there is a medical reason for the peeing. And to discuss possible behaviour issues, it's a very common issue vets deal with. A UTI is one medical possibility for peeing. I can't see any recent data on the spreadsheet, so can't tell if blood sugar is an issue. I've heard of some people using Feliway plug ins to stop peeing. Making sure he likes his litter, trying different kinds, getting new litter boxes as old one smell after a while to cats, making sure there are enough around the house. If there are other cats is he getting blocked from accessing the LB? Dr. Elsey makes a product called Litter Attract, which you can buy with litter or as a separate product you sprinkle on the litter.
