This looks like a good route to me and I have been over the Raton--Amarillo portion so many times I know the scenery by heart.
I haven't been south of where US 385 crosses I-40 as I am always headed East from there, but there are not many small towns in that part of West Texas.
Clayton, Texline, Dalhart, are about the only towns along the Raton to Vega portion of the route.
You will pass by the Cal Farley Boys' Ranch on 385. We stayed there for their annual Youth Rodeo in their very adequate RV campground.