70% of hair still growing back after 6th laser hair removal session, 3 more sessions left, is this normal and is there any hope?

After each session, for the first 2 weeks, I can wait long in between shaves and the hair is thinner and lighter, but after 4 weeks after each session, the hair grows back similar to prior LHR. The hair loss seems to be improving but then suddenly comes back similarily pre-LHR before the next treatment. I am going in for my 7th/9 treatment, and I heard 80% should be gone by now, but I've only lost about 20%. Would 12 treatments be more effective than 9 for me, or am I not compatible?