Downstroke blackout = Losing awareness of all that is involved in clearing the right hip (clear as in slide or move out of the way to avoid right hip/elbow interference).
Like almost all involved in golf, you can do a better job of promoting hip clearance on the range than you can when actually playing. During practice, you don't feel as much desire to steer the ball to the hole, or to over-accelerate. I'd say certainly know this when you play.
Maintain clubhead feel until after impact (A lot easier said than done, when you feel you must make the ball go X yards). That's almost a sure bet that your body will have done what is necessary to avoid right hip/elbow interference, as if the interference occurred, throw away would have resulted, which, in turn, would have made you lose clubhead feel.
Also, let the brain know how you'd like the body to respond to the hands per 8-1 and by practicing downstroke waggles.