Aside from the 4 tests per day, which is fine by SLGS standards, and the weekly curve, I would say additional testing may be ‘safety’ testing.
Some potential scenarios:
In SLGS, you can shoot any number above 90. So, if you get a number under 90 at preshot, you may need to stall, withhold food and retest. That is one potential scenario.
Another scenario where you would want to retest in a cycle if you see a lower number. While SLGS has a reduction point under 90, and the goal of SLGS is to keep kitty above 90, we know that we don’t want any kitty to drop into un unsafe number. The extra testing would be intended to make sure Squeaky is rising and is staying safe.
Under 50 - absolutely will require tests and following the low number protocol of feeding HC/honey/karo.
https://felinediabetes.com/FDMB/threads/dont-panic-or-how-to-handle-low-numbers.210109/
In the 50’s-90 - you’ll want to monitor via extra tests to make sure he is safe and coming up. You have been doing good so far feeding these types of numbers from what I can tell on your SS. How many tests, I can’t really give you rules. Every scenario is different and depends on where you are at in the cycle, nadir, etc. If it were my cat and I saw him in the 50’s (and others would probably agree), I would be testing again after feeding (at the latest an hour later) to make sure he wasn’t dropping below 50. 60’s to 90’s depends. This is where ‘know thy cat’ and the data you have collected is important. How easy is it to bring Squeaky up, how carb sensitive, etc.
Again, the goal of SLGS is to keep kitty above 90, but in case you see a lower green number, some food for thought.
If you see a big drop in numbers from preshot to the next test - this could be another scenario for extra testing consideration too.
Maybe others have more advisement, but some potential scenarios (but not all) to consider for additional tests beyond the 4 per day.
