I brought this issue up some time ago. The change in tempo with change in style is often a pain in the neck. I usually decide on the tempo of a song before I settle on a style and often go from style to style (and having to reset the tempo) until I make a decision. One thing that I do to help me out is to use the text feature to write in the tempo at the bottom of each of the chord charts I use so that if the tempo is somehow altered by iRP I can quickly reset it.