I have a hump in my floor that was caused by whoever framed the stair well in my basement. The issue is, when the framing was done to form the stair way, the plan called for a door at the bottom of the stairs to our basement. So, the framer framed up a door opening, angled it in under the floor truss, and forced it into place. The problem with this door frame is, it was built at 3/4" too tall, and the framer actually lifted up the floor truss 3/4" where that door frame is. So now, my floor has a hump in it at the bottom of the stairs that go to the second floor bedrooms. I have since cut the door framing down 3/4" hoping that the floor would settle, but it hasn't in 3 years. Anyone have any ideas how to get rid of this hump?

Thanks