Awwww. I had no idea - you have seemed so composed and right on top of things, LOL!!!! It's ok to have anxiety about it, but don't let that stop you from following a plan to get him regulated. I think people have an easier time on the Ls b/c they have a written protocol, and you just follow the instructions (well, more or less, I'm sure it's not *quite* that simple). Compared to here, where people are all over the map on how to approach dosing and increases, etc.
But I think if you let the anxiety stop you from giving him the insulin he needs, that's not the solution. I mean you are doing great overall really, but if you can look at the SS and your conclusion is that he needs more insulin, but then you don't do it out of fear, then I would say pop some pills and just do it anyway. I have struggled in the past with some big anxiety problems, and anytime I let that guide my decisions, it's a whopping backfire for me.
The irony for you and for others here, is that when you do get them regulated, it is SUCH a relief. Yes it is scary to be seeing only blues and greens when you aren't used to them, but I think everyone will feel so much better if they can get their cats regulated. For some reason we tend not to find the yellows & pinks scary, but really they are ... a LOT scarier IMO than a 50 say. A cat that is in all blues and maybe a couple yellows but no greens, fine, I'm not going to argue there. But anything above 200 is not a good place for them to be. Not to add to your anxiety

I'm just on a kick I guess right now.
It is sad to see several cats hovering in numbers that are higher. Generally speaking, I think people need to get cracking on the insulin increases, or if that is not a good option for whatever reason, then go with a different insulin where hopefully they will have a better chance of being able to do the increases there. I have seen cats get regulated on one of the Ls simply (IMO) b/c the protocol gave their bean an more comfortable way to work up through the doses. We had one who needed something like 6u and she just couldn't get there on PZI, the increases were too scary even at like 2u for her to keep plugging away at them. But once on L, she was able to do it and got her kitty regulated. Sometimes a switch may not be needed due to the insulin itself, but still can be needed to get them regulated.