I noticed that you had a note on the day before that you were thinking of going up in dose. Aren't you glad you didn't?

We have to learn patience in dealing with this and not be too quick to jump up and up and up (like the vet did). You do not want to cause extreme drops during the cycles but rather keep a gentle curve (highest at pre-shot, going down until somewhere around mid-cycle-ish then heading back up before next pre-shot) and allow his body to adjust somewhat gradually. How they respond to insulin can and does change over time, and it does not necessarily seem to make sense to us. That can be a really good thing though. If you think about it, you want the pancreas to start working on it's own. If that happens, it should mean needing less and less insulin and maybe even none - the ultimate goal.
If you want, you could drop to 2.25 rather than all the way to 2 and see how that goes. Either way, you will be able to adjust again, if needed. Just keep getting those pre-shot and mid-cycle (when possible) tests. The dosing changes need to be based not just on pre-shot but also on mid-cycle - or in other words, the impact the current dose is having.
Based on your spreadsheet note, I think you waited 20 minutes and re-tested (it does not say if you fed or not, but 'not' is the way to go). That is the recommended thing to do. If you do that once or even twice and the number is not rising enough that you are comfortable giving the shot (after feeding), then you skip the shot. So, you did the right thing.