Ok, so I spoke to Chris Ludwig, who sold me the RTEK, and it turns out that the unit he sold me was actually an older unit that did not have the MOP feature available. I explained to him how I blocked off my MOP, and trimmed the plug off the harness, and he told me that this might be my problem.
I called DTI, and sure enough, the unit is one of the earlier models which does not feature the MOP delete option. Fortunately, I can order an update chip for $10 and then it should be up to date on all the specs, including the MOP option.
This has given me much relief, and is very likely all that there is to my problem, however this also means that I will not be able to drive to DGRR this year.....
Oh well, there's always next year, and apart from this little issue, which was out of my control, I kept my promise to get it done and running by DGGR!
If there are still issues after I install the chip, I will update this thread again.
Max.