As a general rule, at the beginning of managing your cat's diabetes, you don't want to shoot lower numbers (e.g., below 150 - 200). As you gain more experience and confidence, you want to start shooting progressively lower numbers. Generally, people using TR won't shoot below 90. However, by comparison, with TR, you don't shoot below 50 so you have a decent margin with SLGS.
Just to point out some of why I asked about which dosing method you're using, the drop into the 50s during then PM cycle on 5/24 warranted a dose reduction with SLGS. You reduce if numbers are below 90.