I install last season a set of 10 aquatherm soloar panels on my roof. I installed the hold down straps and and clamps as instructed but both bottoms ripped of this winter. Also, the hold down strap coating ripped off. I didnt think I lived in a high wind zone but I guess I do! I used the standard screw that came with the setup. I think they are about 3 inches long. Please advise how to repair and prevent this from happening again!