Excellent, that seems to have worked out well. No, medium or high carb was not required for 75, he was still very safe. But it was early enough that extra monitoring was required, which you did very nicely. I have a nice collection of various carbs in my pantry

, it might be good to get some canned food that is higher than 6% in case you need it.
What you are asking really is an every cat is different (ECID) thing, mixed with a bit of "it depends". For Mav I have a good sense of how carb sensitive he is, and really understand his cycles (onset, nadir, duration) since I've collected a lot of data over the last two years, so I find if I see him drop too quickly early in the cycle, I can feed some higher LC to help flatten him out. That said, he does surprise me now and again, just to keep things interesting.
Take action is under 50 (68 on AT2) with medium or high carb, sometimes syrup if it warrants, though we are all a bit different since each of our cats are individual in their responses to insulin and carbs, and our action often depends on how well we know our cat with data we have gathered. As an example, I have never had to use syrup, but certainly that is the quickest method to get numbers up immediately if they are dangerously low, and your cat is exhibiting symptoms of hypo. The problem with syrup is it wears off quickly. Some members prefer to give a little drop of syrup in with MC food, it seems to work for them, but I've never needed it since Mav responds well to just MC food.
I like that Jackson had a nice AMPS, some kitties can do a delayed bounce, so don't be too disappointed if he decides to take it easy tonight

. Hope he stays of the trampoline and keeps up with these better numbers.