I was in the same boat when I came to weather mine, that and I had no prior experience in weathering so it was a bit of a learning curve and trial/error to get something to my liking. I used pandas videos as guidance and used primarily the raw and burnt umbers layering one on at a time, then I went back with a scrub pad to take some of the paint off because it was too heavy to my liking, the saying less is more is definitely true in this . Then I sprinkled in some fullers earth to give it some texture and blast hits in some spots.
But I can relate to the OP about being undecisive through the process , constantly analyzing each piece and wanting to start over again, it began to drive me insane because I wanted it to look great when done. Eventually I just took a step back and followed through with the process I liked and trusted the path I was on, and thus was very happy with how it come out in the end.
In reference to the photos, I agree that the second attempt on the back pieces looks really good , a much even dusty tone across the surface , it looks great what you're doing there! You got this!