I am struck by the high mortality rate involved in the transport process. The example you give of a more "enlightened" than average Captain who kept more of his slaves alive to be sold than other skippers, seems to make good business sense. It is strange that others preferred to treat the slaves worse, when it was really in the slavers own interest to do better.

It is an extreme example of amoral, short termist capitalism. The supply of new slaves seems to have been regarded as endless, so it was considered simpler to acquire new people than to treat the existing ones better.

Education about slavery in this period should combine examples of the stories of slavers and individual slaves with more systematic explanations of the economic and social consequences in each of the three legs of the triangle.

The inhumanity of the system should emerge clearly from the material, without the need for too much heavy handed moralising. I presume it is more effective to have schoolchildren come to their own conclusions, on the basis of the evidence,  rather than just be told what they should think.

I suppose a full examination of the topic would need to expand it to examine slavery in other eras and cultures. The status of a slave in the Roman Empire was rather different than the sort of slavery examined in these three diaries (scope for a compare and contrast question to see if the pupil had been paying attention to this course of study).

You have done a superb job of assembling information from different sources beating on different aspects of the subject. By starting with one port you have been able to give a useful summary of a complex topic, in three comparatively brief essays.