I wouldn't call going 130 or higher being careful on your first outing. Aerodynamic load can be significant. There is a reason BMW calls for betalink to be used for the CS rear spoiler and the CS front spoiler requires metal brackets. I hope you can fix it without too much trouble. My CS rear spoiler was installed onto PPF with double sided tape and I get worried it'll be torn off one day, but I tend to overthink these things, so who knows.
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