@Lydiahillingdon . Welcome to the forum.
What a wonderful opening post. Doctors and specialists, as knowledgeable as they are never fully understand US and how we live with diabetes.
High HbA1C = up the insulin. It's a perfectly good suggestion. Problem is though they don't actually look at why you're having to increase your insulin. It could be a change of diet, different employment, a change to your daily routine to list just a few.
It's very easy to end up on that " see saw" with our control. We up the insulin, we go low, we eat, we go high, we up the insulin, we get stressed, HbA1C goes up, we get told to up the insulin.
Sometimes we have to get off the **** " see saw " and start afresh with finding the right balance. The more we put on one side the more we need to put on the other side. It doesn't really matter how much we put on either side as long as we keep a reasonable balance.
Congratulations to yourself for finding a far better balance.
As an aside if you get offered a libre accept it. They offer a lot of information that can be used in such a positive way and are in no way intrusive.