There's 2 ways I would look at this.
First: You have to have a knack of when a trend is about to start when dealing with single numbers.
Secondly: You'll have to know when a number has run it's course. Tricky, but nonetheless.
It's just like the recent doubles marathon here in Florida. I think we had about 7 doubles in 8 or 9 days. WOW!
Time to lay off on the doubles...LOL
After a while you feel it in your stomach.