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The tree leaves looks dark green to me. I wouldn't give any fertilizer anymore this year.Depending on the weather it could flush late and not have flowers next year on the new growth.I have a couple larger mango trees and I don't fertilize them at all. I do give my young mangos8-4-8. My neighbor gave his large Lancetilla and Angie fertilizer non stop last year and the leavesare super dark green and not one flower this year.
I would not give them any nitrogen, unless you're wanting them to get big quickly. Be careful not to feed the grass with nitrogen too close to the root zone either.There is a special 0-3-16 formulation that Har / Guanabanus helped create which is sold by Truly Tropical and is perfect for mangoes on our sandy soil: https://www.themangoplace.com/fertilizers