For me the "playing luck" goes pretty much in clusters. When I feel like in good shape (not stressed, excited, tired or drunk:)) the scores are the best. And a good round on a small RG is usually a sign for a good round on the 1000er. Though for the latter, starting well (-5 or better after the first 4 holes) is key, as it removes the pressure...
Now I was certainly out of "score luck", as when I first made a 52, I lost on the tiebreaker, and now with a 51 lost to a 50... :/