Step one is to free yourselves from the paper and allow yourselves the freedom to do as you damn well please.

Step two is to think about the singer's needs for breathing breaks, also known as instrumental breaks.

If you listen, the song or tune will often tell you what to use for breaks or turn-arounds.

Don't look for a set formula. Look for whatever seems to work with a particular piece.

Most importantly, have fun experimenting. It seems like you've already discovered that. Now enjoy it.