When I played softball, I remember the coach always telling us never to swing on a 3-0 or 3-1 pitch; force the pitcher to throw consecutive strikes. Statistically speaking that's probably a good philosophy, as it likely results in more walks than outs. But if you never swing on those pitches, then the pitcher is just going to serve up one or two fat ones right down the middle. As a hitter, I liked to keep the pitcher honest, so my conventional wisdom is "rarely swing on a 3-0 or 3-1 pitch." (I finally convinced my coach of that when I swung on a 3-0 pitch and knocked in two runs.)
Likewise, a R-R-P pattern works best when used more often than not, but sometimes you have to take advantage of the fact that they're expecting a run, and sling it on first down.