My insurance would not cover my shingles blowing off because there were not enough blow off. I've had to climb up and fix mine several times, but it's finally done and last windstorm we had no new blown off shingles. I feel your pain.
In Maine asphalt shingles warranty is void below a 4 pitch. Less than that and you lose the warranty or you have to use something else, like epdm. Good luck.
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