Pepper
I can try and fix the SS for you in a little bit if you'd like. I still have editing rights.
Julie gave some great info on the depot and approaches. Let me run through what would have been a good approach to take.
If you get a number in the 40s close to shot time, take a deep breath, don't feed, and retest in 15 minutes. If he's not coming up, feed
one teaspoon of low carb food as indicated in
Shooting Low Numbers. Then 20-30 minutes after he eats, retest to see if he is rising. The reason we do this is because often the insulin duration is decreasing as you get to the next shot time. You don't want to over feed because the goal is to just feed enough low carb food (one tsp) to get them out of the 40s but which won't give you such a huge food spike.
Normally, once they are coming up above 50 after following the above procedure, if the CG has supplies and is available to test, it would be appropriate to shoot the rise. If you are new and don't have much data, as in this situation, you might continue to stall a little longer without feeding. Last night when he was at 164, you could have easily shot even though you had fed him. As Sienne said, when you are at the end of the cycle and numbers are rising like that...that fast, you don't have to wait two hours without food to shoot. You could have shot the 164 and then given a little more food to keep the numbers rising.
Remember this about Lantus......it's best to not make fast changes. Any dose change can wait unless he goes below 50. If he drops below 50, you want to reduce the dose by 0.25u. However, keep in mind that if he goes below 50 once cycle and by the next shot time, he's high 200s or above, you can shoot the dose he was on that got him into the 50s once to help him through the bounce and then reduce. But if you can't decide whether to increase or not, post and ask for help. And if no one responds, it can wait one more cycle. Don't dose hop.
Also, when starting out, it's best to not fatten or shave doses. Stick with 0.25u increases and decreases (unless otherwise called for in the TR Protocol or SLGS Approach).
One last comment for the masses

...the only
protocol used in this ISG is Tight Regulation or the modified TR protocol. SLGS is not a
protocol...it is an approach we also use in this ISG but it is not based on scientific research. There are other protocols and methods of managing FD used by other forums.
As Melanie and Ghengis
@Brashworks would say...stay calm and test on.