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If I were you then, I would probably leave your humidity as is for now and see what happens. I would probably gently rinse the one that has not lost enough weight to see if that helps it lose enough moisture before hatch. Barring that, you might also just spritz it a couple times a day with water to see if you can get it caught up with the others. Usually, 35% is too low (would be for here in my environment), but not always. If the air cells are not large enough, you are having the opposite problem so definitely do not add moisture. These numbers quoted are only a guideline. Always defer to the appearance of the air cells and the weight.
Eggs that have been washed also lose much more weight than those that haven't, hence requiring more humidity. In your situation, you can use this to your advantage. That is why I suggested rinsing it or starting to spritz it with water. I have started doing that with individual eggs that have not lost enough moisture and it has worked wonderfully several times now.