Pleased I came across this thread. I'm looking at the EX for staining too. You've done well rjmc to get it to this stage. The black red is looking good!
I had the same problem with the gap in the neck pocket on my AG kit when I had to kick the neck to line the strings up right. I filled it with glue and saw dust. The stain didn't take to it but the Tru Oil did help a lot when I did the finish coats.