A lot of valid points are already mentioned.
here is another that no one has mentioned yet.
A lot of people do not realize that protein also does require insulin. Up to 50% of protein is slowly converted to glucose. So you may be bolusing enough for the carbs, but as you are now eating more protein (I am assuming, you are, as a lot of people do when cutting the carbs), your body doesnt have enough for the converted protein.
when I was doing low carb and eating more meat, I had to reduce my i:C quite a bit to cover all the extra protein. You may want to try that, or, enter more carbs to cover the extra protein. (though because it is slowly converted to glucose, you may need to try an extended bolus to make sure you do not go low. That slow - rise may be due to that slow conversion and not an inappropriate basal.
I also noticed that being low-carb, the effect of the insulin was much slower.
All food for thought!
Also if you plan on staying low carb for a while, I would suggest reading Dr Bernstein’s books, even if you do not follow his diet entirely. as his is also a low carb (but very stringent) he does have some good advice.
All the best!