I figured out the tension. The bracket was bent due to the car wash.Mine's been on for about 6 1/2 years with no problems:
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Of course, I only use touchless car washes.
I like the idea of epoxying a washer to the broken tab to reinforce it.
When I installed mine, there was no tension when fastening it down - the shield matched the contour of the hood perfectly. You might want to try loosening all the fasteners then re-tighten them starting in the center and working outwards to the left and right one fastener at a time. That should, at least, equalize any tension.
HTH