Everything looks really weird to me. Not how I used to see other tropical places. Totally different weeds.
What is your elevation? Do cherimoyas fruit for other people around you? I wonder if you are high enough? Coconut and cherimoya are generally not the same climate fruit, with few rare overlapping exceptions. You have them both.
I think there is little commercial potential with your planting selection. Mangoes unlikely to fruit well judging by climate alone and your soil description. Amazon tree grape is very low commercial value. No idea of Inga bean value, never seen them in Peru. . Avocados are probably only exception given right varieties. Assuming ideal scenario, and everything grows to a size they are suppose to, I think just about everything is planted too close. It's likely to become problematic in 5 years. Just my 2 cents observation.
I'm big proponent of marang. I think should be planted everywhere in tropics. One of the best fruits in the world, will always have good commercial value once people get to know it in a new place. Big, very beautiful low spreading tree (with proper pruning ). Easy to collect large fruits. 3-4 years from seed. Falling leaves automatically create mulch and prevent weeds. No need to cut grass around the tree once it's big enough. You should definitely introduce some and see how they do in your place. Despite thriving in lowland tropics, I have seen them growing well as high as 1300 meters elevation.
I would try to introduce sheep instead of cows. Cows eat mango leaves and other fruit tree leaves. Sheep unlikely to do so and reach high enough. Also they are lighter animals, hooves will not make such impact in the soil as cows. Thus preventing erosion.
There's been some debate whether or not those are actually "cherimoyas." I'm no expert. Others on here could analyze better.
We're at about 950m elevation. Yes, everything is "too close" from a traditional farming perspective. Half of what we planted is support species, so double the distance. Most of what we planted is seed-grown. Subtract what succumbs to disease, predation, etc. and the specimens that don't produce quality fruit, then you'll end up with a lot more distance. Also, for the overall health of the systsem, in general it's better to overplant. This ecosytem wants to be a forest, so it needs woody material to feed the fungal soils. Our original soil tests showed this place to be pretty low in SOM.
Let's see what else? Mangoes. There are a lot of mango trees nearby that fruit well. Inga fruit is very commercial here, but also not really worth the effort in our situation.
If my original goal was to turn a quick profit from this place, I would've alleycropped the entire property with proven timber species and grafted fruit trees intercropped with coffee and left ten meter wide alleys in between the rows of trees to raise beef cattle to slaughter. Although I'm not convinced grafted is the way to go. There really aren't many successful examples locally. Most successful fruit trees people have are seedlings like Avocados and Caimito. The vast majority of everyone grows coffee for money. It's an endeavor that is lucrative to most because they go up in the national forest, clearcut tracts of land, and burn everything off. They get the nice virgin soil, exploit it for a few years and then move on.
The original goal of our place was more a dream-land place for personal use. Highly experimental, since we didn't know what would be successful. Turns out it's a lot of the stuff I had never heard of before. We planted about 40 species of tree, what makes you so confident to paint with a broad brush and say that none other than avocados will have much commercial potential? Lots of the specimens out here would beg to differ.
I'm not motivated to sell fresh fruit given our location and access. The only sensical thing is to produce value-added products like dried fruits, fermented products, medicinal plant-based supplements, and animals. We plan to start guinea pigs soon, because there is already a lot of Elephant grass and other fodder trees growing on site that could provide 90+ percent of their diet. Sounds very low-overhead to me.
Originally I wanted to raise sheep out here, but that's not practical. Tropical sheep breeds do tend to stand on their hind legs to eat trees, which can rival the 2m browse line of cattle, and I've also been told they are more likely to de-bark trees than cows.
Brachiaria spp. are toxic to sheep and will kill them, if they are the majority of their diet. That is the vast majority of grass that we have out on pasture. Also, there is no local market for sheep meat. I'm curious why you and Finca are not fans of the idea of raising cows in this situation. Do you have experience raising cattle? It's not something I plan to do right away. Need to keep an eye on the trees to see if they would be big enough to handle the impact. We've got a ways to go still.
Do you have a scientific name for Marang? I appreciate the suggestion. Any idea if it's available in Peru?
Here's a farming approach that might seem crazy to you:
https://www.youtube.com/watch?v=RePJ3rJa1Wg