Har - I actually consider the two lesser South American Annona species I have tasted much better than the bigger cultivated ones (have not tried Annona diversifolia though) - but they do have a poor pulp to seed ratio, and as described by you - small seeds which stick to the pulp. From studies I have seen A. senegalensis as one of the top preferred native species for both Uganda and Tanzania. And yes the Monodora is around the max size for this species according to my literature.
Here is another photo - I still have not opened the Monodora as it appears unripe;
Regarding the star apple - I received the fruits as C. gorongosanum but its fruits never gets to this size and is hairy too and brown not green/yellow in color. In addition; the color of the flesh resembles C. albidum. However I have done some background checking and the African Star Apple is also present in Uganda; C. africanum - so that I can rule out completely as I don't have the key for this species (only the two first). My source claims the leaves were purple - which is not consistent with C. albidum - but he was not collecting them himself and there could be some misunderstanding taken place (which is why they were labeled C. gorongosanum). The pulp is very aromatic with a sweet fruity scent.
He claims what C. albidum is not yet ripe and will get them for me later, so I look forward to see what he then will bring.
Both Monodora and the star apple were collected in Budongo forest, while A. senegalensis were from Lira district.