Taking that much water out may be troublesome for you this winter, but I guess it depends upon where you live. If you get lots of ice and snow then the weight of the cover may cause problems. We usually take our water down to just below the return and then cover the pool. Some folks (my bro-in-law owner of a 30' AGP) don't take any water out, they just cover the skimmer and cover up the pool.
I hope that isn't too low because we took ours down to the same level, 6 inches below the return on a 52" high pool. DH will have a fit if I tell him we have to add more water! We are in Western Pa. and usually have tons of snow and ice.