The fact that you are eligible for disability retirement and social security disability has no bearing whatsoever on your eligibility for workers compensation. They are different programs with different standards. Do not dwell on that aspect of your claim. They have been approved and there is nothing more to do there.
So you have been to a second opinion but do not yet have the results. Wait for the result before taking any further steps. If the reprot from thr second opinion is favorable you do not want OWCP thrwoing it out because the SOAF is inaccurate, do you? If the second opinion is not favorable, then bring in the issues you have with the SOAF. OWCP will probably pay little or no attention, but make the object in writing.
What OWCP should do if the second opinion is not favorable to you is to send a copy of the second opinion to your doctor and ask for his/her approval or disapproval. If your doctor concurs with the second opinion, you are screwed. If your doctor does not agree, OWCP should schedule a referee examination. Notice that I said should. That is, the right thing to so is schedule the referee- but OWCP doesn't always do the right thing as you are well aware.
This is a brief outline of your options. I ma sure you may have more, but what I have wriiten is based only upon what you have decided to reveal. If you get an adverse decision, appeal, appeal and appeal again.