David my friend.
Sorry to hear about "Mottlegate"... I just recovered over "Decalgate" myself...
It looks like you are well on your way with a fix for this too. At least you can fall back on the Fortress build while you are waiting for parts to arrive.
One little trick I learned about air "bussing" on German mottling is that the paint has to be very thin. I'm talking like almost a water or skim milk consistency.
I also lower the air pressure and spray little random spots. When you change color (all depending on if you have a photo or not, and the factory where the plane was produced), try to mimic the pattern seen most commonly associated with the type.
Then if you have overspray or an area that you are not happy with, go back and try a little touch up using a different color. It's basically trial and error until you're happy with the results.
Very seldom (if ever) have I achieved the look I was after on the very first go. For me it just doesn't happen. I have always had to go back and add / subtract from the mottling until I liked what I saw.
That looks like a great book to read... and I hope your week is a good one.