Where are you getting “at least 40% growth” these figures aren’t accurate at all. There are no absolutes and no one-size-fits-all in hair transplant surgery.
For some, growth comes at 5 months, for others, its 8 months. It’s like being 15 years old upset that you can’t grow a beard. Trust in the process, you’ve selected a good surgeon and I see growth, but it’s not matured yet. As the months progress you’ll see further maturation and hair thickening along with hair growth.