Disclaimer: I understand that masturbation is a very uncomfortable topic to discuss but it is a topic many Shi’a struggle with and I would like to do my part in helping, praying that you could help too.
Other than the hadith of Imam Sadiq saying masturbation is wrong and telling the story of Imam Ali hitting the hands of the sinner and setting up their marriage, would you be able to provide more narrations? The internet does not contain more than this for the average person. Knowledge is power in sha allah this can aid.