The resort will fill up during the Spring Break" Season but you should not have a problem making a ressie if you call right at the 7 month window. You would also improve your chances if you wanted a 2-bedroom since most of the resort is made up of this size rooms.
We have been to the resort many times when it was sold-out and it never had a feeling of being crowded.
On the other DVCpoints charts, it specifies that dates for spring break change each year, and to be sure to refer to the appropriate chart, but it dosn't make the statement, so if Easter is in March, do I use the Choice Season chart for points, since it doesn't say to use premier?