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For low latitudes (<10 degrees on both sides of the equator) most land are either islands or relatively narrow land (longitude-wise). This results in an oceanic climate (not the subtropical one). I mean places like Singapore, KL, Jakarta have extremely low record highs when compared against their average. 32-33c average high and 36-38c record high. What happens if a giant land (say the size of Australia) straddles the equator? Will the climate be more extreme?
Mbuji-Mayi, DR Congo (6°S, 500m), is quite at the center of tropical Africa and its monthly averages hover around 18-32°C (dry season) / 20-30°C (wet season). So I don't think it makes much of a difference when you take altitude into account.