My endo and my old GP both say diabetics tend to do better with levels between 1 and 2. Both of them have observed this on their own from their patients - not read it in a textbook. However my new D consultant - who is a fair bit younger than me! - says exactly the same.
Have you asked your consultant, Paul? If not, I should - but why isn't he jumping up and down about your TSH level, anyway?