I ripped up the old hardwood in the kitchen. The plywood subfloor is uneven. Now I want to lay a quality laminate flooring with underlayment. The room is a kitchen and a dining area measuring 25' x 15'. The uneven part of the plywood subfloor runs width of the center of the entire room. The plywood is 1/2 inch higher than the other section. You can see the uneven line in the pics before and after. There is a den under the kitchen and the studs run the width of the room. Need help!