Just as above, you have not left yourself time to do any sightseeing. Even 500 miles a day leaves very little time to see much along the way. Certainly does not give you time to stop anywhere to really appreciate a place of interest. You say you like scenic routes, but do not give yourself any time to enjoy them. Scenic routes, with a few exceptions, are off interstate routes and as such usually slower speeds and more time consuming, though often vastly more memorable.
If you don't want to do a fly drive trip, I would drop one of the destinations and concentrate on the sights to and from the other.
Don't believe all you hear.
Lifey