Individual response to HGH varies pretty wildly, and estrogen levels can impact it (more estrogen, more response, to a certain point)
4IU is enough to put me right above 500 IGF-1, which is more than you would need for fat loss/recomp type purposes, but 3-4 IU are pretty common amounts for people to settle on. Start a little low, titrate up after a couple of weeks. People tend to get swelling, edema, carpal tunnel, etc., if they go too high too fast.
I'm happy I respond well to HGH, since I respond like jack shit to testosterone itself. All the way up to 250mg/w now and still in reference range, lol.
One thing to keep in mind with both tesa/ip and regular HGH is that you will put on some additional water weight when you start, and potentially again as you go up in dosage, so the scale might move up instead of down as your body gets used to it.