The Western Express goes through some desolate areas where you get whatever services are available when they are available. Some days you might have to ride much further than 80 miles to get the services you need (motel, restaurant) and others the choice will be to ride less. I think you would profit from roughing out your stopping places each night and then seeing if you will be able to do that pace.
Further, your schedule calls for riding 30 days out of 33, not leaving you much leeway or rest time. I typically plan for 1 rest day out of 5 and often look forward to the day off.
This isn't a ride you want to do without thorough planning.
Ray