One very important thing to keep in mind is that the numbers are not the cat.
You may see some people post WCR - whole cat report - and what it means is that your kitty is way more than just the numbers.
In many cases, people see their cats changing for the better but are puzzled because the numbers are not better as well. Look to the cat for signs, and if you see your cat improving, be happy. And don't worry about the numbers; they will improve once everything settles. You need to keep in mind that there is the shed that is still filling - that's the reason the protocol calls for holding the first dose for 5-7 days so that the shed fills and then Lantus can start working well.
There are lots of things to consider including the diet and when you are feeding, plus dose and any other health issues.
Bottom line: Always look to the cat for improvement because it will come in time.