Regrowth isn’t always perfect and can be really slow. My hair changed a lot as it regrew and it took about two years from the beginning of regrowth to settle down. As you have indicated, sometimes the texture of the hair has changed, not just the quantity. Different medications can affect people differently - I’ve been on Letrozole for eight years and my hair hasn’t thinned overall although my ‘shed pattern’ changed (from evidence of remarkably little to a much more normal amount, although seemed like an awful lot to me!). I found it hard to get anyone who specialises in this, a dermatologist was as much help as anybody. Best wishes.