My takeaway is that if you are going to have a protagonist with face blindness, leverage it to the max; the plot should pivot on that disability. But? I'm not sure how it does in your latest iteration.
>>>and confront his traumatic past
So having face-blindness isn't of itself a big enough personal problem to wrestle with?? And? conversely, if he "confronts his traumatic past" -- whatever that entails -- it won't cure his face-blindness.? He will still have to cope with the disability every day of his life.? IOW: I think the face-blindness is his central personal problem,? past trauma is a sidebar issue.
Whatever, for the purpose of a logline, the "traumatic past" is a subjective issue, hence extraneous, not necessary to mention in the logline.? Loglines are about protagonists striving toward an objective goals in the future, not dealing with subjective issues in the past.
fwiw