Have to disagree with DC Carver that the rack is twistable. A piece of 3/16 air craft al. flat 14" wide, approxiatmently 16 length and your are going to twist it and twist it back I don't think so.
I hae the same rack and it will never do as you stated. And now I see how rumors get started only some of the information and not all the information to base ones alleged expert opinion.
That piece of foam is needed to help support the tail of the rack. Yamaha"s max. weight to be supported by the tail section not to exceed 12 pounds.
If you twisted the rack you were twisting the two bolt stays that Yahmaha mounted under the fender and the the center bolt, when the bike was hit, the brackets where they mount came lose or bent or even the bolts losened up.
I did a fit-ment for the rack for the 05 for them, I believe I have a little more info than just a guess.