Great work So. It may have been good to mention the occasions when Elders and MSs are alone with minors. This includes witnessing work, bible studies and occasions when minors approach Elders. Also that by their positions alone, minors have absolute trust in them and are indoctrinated to obey them. It is also a practice of theirs to have minors approach an Elder to confess a sin.
You could also have said that it has become evident that they do have child molesters already appointed as Elders and MSs.
It's not too late to send another letter.