We live in a house built in 1974 that had insufficient ventilation in the attic which caused humidity. Mildew started to grow and spread to the insulation towards the outside of the roof. I ripped out the insulation along the edges and had the mildew removed / fixed the attic to increase ventilation. I now have a 9" gap of insulation along the outside edge of the attic where I tore out the moldy pieces. I believe I am losing heat in this area and also causing snow melt to back flow into the house. I want to replace the insulation, but I don't know if I can just cut out 6" wide pieces of insulation and lay them into the gap? I'm concerned that if I don't lay it flush to the attic floor (the pieces I tore out are uneven) that I could inhibit airflow in those areas and get mold growth. Is that a concern or should I just lay in the cut out insulation?