Still have hair post 10 IPL sessions

I’ve had a total of 10 sessions with IPL and pulsed diode array devices over the course of a year and half. I am a skin type 4 (or maybe 5 if I want to consider myself on the dark side). I have certainly seen a lot reduction in the density of hair on my back but I would say I still have 10 to 20 percent hair left in these areas. Wondering if this is the best one can get out of laser? Or if it is a question of type of device? For instance, should I consider trying Alexandrite at this point? I see lots of conflicting comments about Light sheer diode and don’t know if Alexandrite would do any better. Any thoughts?