That makes a world of difference. Suggestions to fill in the gap.... foam black tape about a quarter inch wide, usually about a quarter inch high.. put it around the cage after painting the cage black. That should actually fill up a lot of it visually... but it'll still be there; just look a lot better.
The Q-Forms are just a terrible design. You just should have dished out the extra 150 to have custom kicks made. That wouldn't have made much more of a dent in your wallet. You should check out eBay and get the EQ mod for your screen. They're running around fifty bucks. Make a world of difference with the MB Quarts.
Sorry about the bashing... we hate seeing people set up their cars like ass... just taking it down to the most popular car audio shop and having them slap it in.