Are the trees between others getting a lot of sun or filtered light?
Lots of sun because everything is still young. My strategy was to overplant and let the trees compete. The more permanent anchor trees like Mango, Avocado, Mamey, Coconut & Sapodilla are spaced at 10 - 15 feet and will eventually predominate. The more disposable fast-fruiting trees packed in around them (banana, papaya, guava, pigeon pea, mulberry) can compete for the leftover resources and provide fruit over the 3-5 years it takes for the shade canopy to close up. Some of the secondary trees will remain productive in the marginal conditions and those that don't will be removed or relocated.
Once the shade canopy of the anchor trees is fully established then I will add culinary & ornamental gingers, tropical heliconias, vines & shade loving ground covers to fill out the landscape with color and texture. For now I am using Canna Lilies and pineapples in that role because they are fine in full sun.
I could also grow dreadlocks and refer to my garden as a "system" with succession planning of syntropic agroforestry but the truth is that I just want to make a lush, beautiful, delicious tropical paradise of plants / flowers / fruits. This video gave me a lot of inspiration, I love the dense, natural look so much more than an orchard style planting with rows of trees standing in isolation. If it costs me a few avocados per year to have butterfly ginger and perennial peanut under the tree then oh well
https://www.youtube.com/watch?v=daSb5or7Sc0