Skip the declarations about how much you care about your grade, how you would never lie, that you deserve a better grade, and that the “other” professors don’t have a problem helping you so I shouldn’t either.
Almost every time I see those lines, it is from a student who didn’t bother to pay attention in class or study, are in the middle of telling me that grandma just died for the 5th time three months ago, and they don’t want to suffer the consequences for their poor decisions during the semester.
Also, you aren’t special. The rules apply to you the same as everyone else. If your email has “I know you said you don’t allow ____, but could you allow me to do that anyway?” in it, just delete it and save both of us the time.