For a different perspective, I dry & cure by feel. I don't own a hydrometer or a thermometer for that matter. My environment is mostly sealed, but I'm at the mercy of ambient temps and RH. In the winter, it's 20-40% RH, in the summer, it's always somewhere north of 40% (on rainy days it's basically 100%).
In the winter, a plant may only need a few days hang dry, then into the jars. When you get that nice audible snap from the branches is usually perfect. If the buds feel a little wet still, I leave the lid on the jar, not tightened, with just a tiny sliver of an opening. I continue to feel them until they feel right, then lid tightened down for the cure.
The only difference in the summer is they may hang dry for significantly longer. And also they'll stay in the jars slightly cracked-open like that for longer too. So really the only difference in my mind is time.
No one seems to complain about the quality of my product.