Thanks for the photos!
3 thoughts ...
1) That thing behind the rear wheel sure is funky!
2) Regarding your front plate, if you MUST have it, you could relocate it further down for partial grille blocking.
3) Your deck lid spoiler is almost certainly there for reduced drag. You'll find very similar low profile spoilers on many eco-model sedans. (Guess: it promotes cleaner flow separation for reduced rear lift/turbulence).