Hello AmyB and Salem! Girl, I am so with you with the anxiety and being info hungry lol. Okay so ProZinc usually hits its peak around +3 to +6. Which means Salem will be at his lowest BG reading at some point during that window. Then when it hits around +7 time his BG levels will start to climb back up.
I'm not very experienced in dosing, but I can offer what I would do if I was in your position for your consideration. I'm not familiar Salem's and being a new diagnosis we don't have enough data yet, so if anything I say sounds off or doesn't apply to you feel free to ignore it. With that being said, let's see..
How long ago did you switch Salem to low carb wet food?
He seems to be doing okay with the 2 units. I know it's scary starting out, but really you're mostly looking for him to be
under 200 before we start skipping shots or reducing doses. If he was reading in the 300s for PS then getting 2 u and dropping to greens/lime greens then we would start considering reducing his insulin. I saw on his SS that his levels rose a bit after the 1.8 dose, so that pretty much tells you that he's doing well with 2 units. He could even need more than that, but again that all depending on when his low carb diet was started and the testing data that you'll gather over time.
The good news is that he is very well out of hypo ranges on all of his numbers, even the blue ones so hopefully that helps you feel more relieved

I see that you have a couple of mid cycle tests too which is great! Those tests are crucial in helping us determine where to go with his dose, so keep getting them in whenever you can (once-twice a day between +3 to +6 time).
Being new to testing, the magic number you're looking for is 200. If he's below 200 for PS
then skip, and make another thread titled something like "New to testing, PS under 200" and someone will be able to help you decide what to do for the next shot!
You're doing great being so vigilant and getting in all the testing. It will pay off in the end!
Do you have a hypo kit set up for Salem? (Cans of FF gravy lovers, Karo syrup, etc.)