i actually had it all the way back and it looked funny. the car had too much slope down before the spoiler. its actually only 3" from the front of the spoiler to the rear edge of the decklid. i think the pictures make it look further forward than it actually is. i think a stock spoiler has about 5" as apposed to 3"
If you are going to keep it where it is I would paint it all red due to the area behind the spoiler being red. I would leave the color of the supports the way they are.
It concerns me as well and I have plans to fix it. Initially it was set back and it just didn't look right. When I moved it forward the gap showed up so I do have plans to bring the edge back down closer to th quarters. Luckily if it ends up not working out I can always just put a stock spoiler on it.