I didn't have any problem with my wing stays up until the time I sold the car 5000+ miles. But I did a few things to help.
1. The wing stays passed through a slot in the wings.
2. I was very careful to minimise any bending of the wing stays.
3. I doubled up the fixings to the upright. Probably different to yours anyway as my car was E 30 based
Cheers Robin
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