The decision by the journal was, "Minor Revisions". So, my paper is provisionally accepted by Foundations of Physics. I have until December 7 to submit the revised version, all of which I may need as I'm planning to add some material in addition to even the current arxiv version. The current arxiv version 8 is already significantly beyond what I sent them in early July as the second revision, which was similar to version 6.
The addition I'm working on beyond what's in version 8 is to derive the de Broglie wavelength in the rest frame of the field source particle. Currently it is only done is the rest frame of the test particle. This will provide more confidence in the correctness of the original (version 8) result. I don't see how anybody can object to that. Even if the journal doesn't want to print it, I want to have it and I will post it on arxiv.
I sent an email to the journal immediately after uploading version 8 to arxiv, to let them know I'd resolved the problem of obtaining only half the de Broglie wavelength, and wanted to submit another revision that would be similar to the arxiv version 8. Also, versions 6 and 7 didn't take proper account of the interparticle separation, R, dependence on time in Equation (33), but this is corrected in version 8. I didn't receive an explicit direction one way or the other but the email is in the saved correspondence, so I take the decision of "minor revisions" as tacit permission to provide the improvements.