Update:
Paint is due in tomorrow.
In my driving the last few days I have noticed better FE with my mods. I also am starting to get lots of looks.
I also found that dust still gets onto the back window but that my washer fluid sprayer came off with the OEM spoiler. Time to fix that.
It is held in on the back side by some plastic tabs:
push them in (used a vice grip to hold them in so I could push it through the hole) and out it came:
some hot glue and it is attached (in about the same spot)
tested and it works!
back shot of car (see my new stickers)