During my time updating spigot from the RB to 580, somewhere along the lines the Ocelots learned math, at a high rate. My main town is in a Jungle biome, rarely had any issues with Ocelots spawning. Then bam, they are every freaking location in town and every jungle biome. Needless to say, no one is worried about creepers in the jungles anymore. Btw, the entity activation range is working like a charm in this situation.