Speaking of panels; I had never had trouble with Dzus fastened .090" aluminum sheet for a belly pan until 2017. It was a new car and at least 80 Dzus fasteners held 18' of belly pan to the chassis. All Dzus wires were adjusted for a tight fit. On the third day, something came loose and the belly pan wadded up and spun the car. To this day, I don't know why all those Dzus buttons did not hold. So, to help ensure things stay put, I now have a 3/16" aluminum plate belly pan and replaced Dzus with about the same number of 1/4-20 stainless flat head bolts screwed into welded nut plates and a jam nut over each one. Not a fast and easy way to remove panels but at least they should stay on the car.
John