Did you see this recent Janish article? He's says it could make sense to dry hop cold for just two days or so before kegging/bottling. I was just listening to a podcast that said to dry hop warm to get the juicy flavors, though, so opinions vary!
http://scottjanish.com/a-case-for-short-and-cool-dry-hopping/
I still think a small dh toward the end of active fermentation is the way to go, though many others have stopped adding during active. My FG target is 1.020, so I did a 2 ounce addition of Citra and Strata at 68 degrees at 1.025, which ended up being 3.5 days in. I plan to follow the Janish advice and do my final DH (6 ounces, Citra, Strata, Mosaic) while soft crashing to 60 two days before bottling. I am trying to reduce astringency/hop bite and of course increase flavor/aroma, so fingers crossed! (I need to bag my hops, so also trying to figure out quantities to compensate for lower extraction.)