@Jancol - Typically, when deciding whether to shoot your lowest number ever, we recommend stalling. That means not feeding the cat, and waiting 15 or 20 minutes before testing again. That way, we can see if the cat's numbers are continuing to decline, or if they're beginning to rise naturally.
If the numbers exhibit a rise, and the number is in the shootable range for whatever protocol you've chosen, then you would test, feed, and shoot as normal.
If the numbers look like they're dropping, then there are a number of things that can be done. You can offer a
small amount of low carb food (less than 10% carbs) and then re-test in 15 or 20 minutes and continue to do this until the numbers are in the safe, shootable range for whatever protocol you've chosen for your cat. You can shoot a reduced dose of insulin. Or you can skip. The decision depends largely on your circumstances.
The point of offering a small amount of low carb food is that we want to make sure the cat is having a natural rise in blood sugar instead of one that is influenced by food. Because shooting a number that is artificially elevated by food could mean trouble when the carbs from the food wear off, the blood sugar drops, and the insulin kicks in and drops the number further. Does that make sense?
A 6.2 is around 120 for those of us in the US (I think). That's a perfectly shootable number for Tight Regulation. It's the cutoff number for Start Low Go Slow. If you were available to be up all night to monitor, had plenty of testing supplies on hand, and materials to deal with low numbers, then you most likely could've tried to shoot that number and see what happens.
If you shot that number, the recommended advice would be to get tests at +1 and +2, which would give you a good idea about how the cycle is going to progress. If the numbers go higher, you can lay off and test a little later. If instead, they're headed down, you can be prepared to intervene with some food earlier in the cycle if necessary to stabilize the numbers.
I know it's a lot of information to handle. So please feel free to ask any questions.