You need to focus in little steps. First, focus in the center of the range, the mid point of what you want in focos. This give yourself a little tilt. Then refocus. Tilt some more. Focus again. Each time you refocus, check your depth of field. Keep repeating the process, focusing, adjusting tilt, focusing again, checking depth of field.
It can take a while to get the shot set up the way you want. And remember, it may not be possible to get everything in focus that you want in focus. There are limits to what the lens can do.
The important thing is to take your time. You can do amazing things with these lenses.