I'd say take it to seventy and once the hatch finishes, drop it back down until lockdown. Then, at lock down, raise it again. I don't know where you're at, but for me, I am able to lift the top momentarily without disturbing the humidity. Also, I don't know if you have an egg turner, but since you still need to turn the eggs, I'd remove the turner completely since you don't want to risk crushing babies. Then, when you're turning the eggs, take a warm damp washcloth and through it over the eggs that you're not turning. It'll help keep them humid long enough to turn your other eggs. This is what I did and it seemed to have worked well. I have pips in my last batch, so I must be doing something right to only have 2 of 15 eggs quit during lockdown.