There seem to be a lot of helpful people on this forum so I'm hoping for some sage advice on this question

The school I attended for undergrad was "experimenting" with a plus/minus grading system, which means that it was *optional* for professors to give us +/- grades. The university did not take the +/- into account when calculating your GPA (A-, A, A+ all counted as 4.0). Because the university didn't take it into account, about half my professors graded on a +/- scale and the other half didn't (I would always ask). I am not sure if the university has since fully migrated to the +/- system.
However, the issue is that I have grades on my transcript that are +/- because some professors chose to grade this way, and for those grades that are right on the mark (A or B) it is impossible to tell if the professor was using a +/- system. I believe that this has worked against me somewhat, as I know for a fact that there are some As on my transcript that would have been A+s if the professor had been using a +/- system. I realize that the opposite could also be true, that there are some As on my transcript that could have been A-s if the teacher was using a +/- system, but I know of no such cases on my transcript, knowing what my class percentages were and having confirmed with professors.
So my question is, is this argument worth pursuing in some form in my applications? Or should this just be a live and let live situation, short of having signed statements from professors that they would have given me an A+ (kidding...)?
Thanks in advance for your thoughts!
ron