I really don't understand the logic in this. I'm guessing it is more political then scientific reason for not moving the track.

From the 5:00PM discussion:
"However...models are becoming in better
agreement on a track across the eastern Gulf of Mexico. Although
the official forecast could have been shifted a little westward due
to the new guidance...it is not prudent to make a change at this
time. The official forecast is now basically to the right of the
guidance envelope...and keeps the hurricane on a northward track
very close to the Florida West Coast."