Gregg, you are so right. But to set the height of rail and stile, start with
coping bit (bearing in center) and adjust the height until you see 1/8" on
underside. That will give you a very important lip on the profile. Make the
cuts on ends of rails and then switch bits. If they are a match set, no setup
required, otherwide set up to fit the rail cuts.
This is a google search that will get you rail and stile bits.