That is a very complicated question! First, I would strongly recommend that you read the yellow "Sticky" posts at the top of the prozinc forum. They will give you the background information you need to manage FD well. The better educated you are about this, the safer you can keep Samson.
Now to your question: yes, the dose does get adjusted over time, but you shouldn't do it yet, and you shouldn't do it alone. Dose changes should only be done either with your vet, or with advice from people here who have been doing this for awhile. Dose changes are a little complicated, especially at first.
Before considering any change, you need to be getting AM and PM pre-shot tests every day, and you'll need some mid-cycle tests. Prozinc usually hits nadir (the lowest point) around +5 or +7 (five to seven hours after the dose). However, every cat is different, so until you are able to get some tests mid-cycle, we can't be sure when Samson hits nadir.
Prozinc is dosed based on the pre-shot test numbers and the nadir, and factoring in the drop between those two numbers. Then when you have enough data and it's determined that a change needs to be made, we recommend changing by no more than 0.25u at a time.
Please don't be overwhelmed by all of that. That's why we're all here to help each other.
So for right now, just keep working on getting those AM/PM tests, and a mid-cycle whenever you can. Then in a couple of days we can look at your data and see what's next. And between now and then you can keep reading the stickies, look at our spreadsheets, read the different threads, and ask all of your questions!