My take?
Wait till the water is about 60 deg to shut down.

In the meantime, raise FC to 12-15 and keep it there.
I'd like to see pH at 7.6-7.8, but at 7.5 I'd leave it alone and not mess with it.

Other than that, I think you are all set. I'm doing the same--my water is about 64 deg so I'm waiting till it goes to 60 or less to shut down. Meanwhile, I have a safety cover and it's on all but the last few clips and everything that can be done (ladders, steps, umbrellas) have been put away.