I have a soft maple that developed a large bark split this past winter. The split is about 7 feet high starting at the base of trunk and is about 6 inches wide at the widest point. The bark has pulled away from the tree for at least 50% of its diameter. (You can tell by looking inside the split and knocking on the bark.) I've read that you should cut away the bark around the split area, but I was wondering if this split was too major, or if there is anything else I should do. Your comments are appreciated...