If you book at your home resort at the 11 month window and want to change at the 7 month window it is not problem to do.
Just beware that if you borrowed points for your stay from your next use year, and the new 7 month resort or room type wind up being less total points than your original 11 month selection, those points are returned to the the use year of your original reservation's stay. Those points then must be used during that use year would then be unable to be banked.
SS is our home resort, but we have never stayed there. We always like to alternate our stays between BLT and VGF. Usually go in August and have rarely found difficulties in booking at the 7 month window.