Of course you have air movment issues. Once that bootlid is closed then you effectively have a sealed area beneath the parcel shelf, which you sub is moving air in. Air will find the weakest parts and move them or blow through them, your 7x10s will be getting moved with this air which is plain fact. Thsi is where the issues come in, this air movement will be affecting the performance of the speaker.
How much or how little depends on other things but it is happening.
Not sure what your quote in your sig is all about either
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