Will a heavy (50-year, 275#) laminate shingle hold up fine on these arched-style barn roofs...where the pitch varies from about 3/12 on the top to nearly vertical on the same slope? I'm mainly concerned about the shingles sealing themselves down on the near vertical portions. The manufactures sometime recomend hand sealing the shingles, but thats a costly and sometimes messy process. Id rather not do that unless its an absolute necessity. This is in a high wind area. Any thoughts or suggestions?