There are many diamond systems. A good printed intro to 10 or 15 of them is in Bob Byrne's books.
Different diamond systems require different amounts of side spin. Some require none. Some require roughly equal amounts of follow and running english. Some require maximum reverse side spin.
One of the most important things to do when learning any diamond system is to understand what spin must be used. If your spin is not consistent, the system will not give consistent results.