Emailing a professor for points on an exam when you want a recommendation from the professor I recently took an exam in my master's program where I missed just enough points to change my grade from A+ to A (in my country, these show up differently on a transcript). I intend on applying to some extremely competitive PhD programs (otherwise I would not be concerned with this grade difference), and given my undergraduate background, this is a course where I am probably expected to get an A+. Furthermore, I am essentially depending on a letter of recommendation from the professor of this course.

After having already looked at the exam with my professor, and hearing him explain the grade justification, I believe I did not yet make a well thought-out argument as to why I should have been given certain points.

My question

Should I bother emailing this professor with my legitimate argument, or simply let it go? I will probably get a rec letter from him either way and while I want an A+ and genuinely think my work on the exam deserved it, I don't want to annoy my professor and make his opinion of me depreciate. 

Edit: In this scenario, I feel that an error was made on the part of the test-writer where a question could've been reasonably interpreted in two distinct ways. I was told that because I was the only person to make this particular interpretation, that it was an unreasonable interpretation. I don't agree with this logic.
Let it go.

You discussed this before, he made his arguments and it is unlikely that he will change his mind. It isn't only up to you to make a good argument for the points, but the professor himself will have judged the points again when you discussed them and will now be convinced that the points are fair.

Begging even more for the points will probably not get you any more points, but may annoy the professor, e.g, because you already discussed it and you are still not satisfied after he told you the final outcome. He has neither the time to discuss this again and again, nor he will consider that he was wrong the first two times (the first assignment, then your previous discussion).