I can understand soil type being a problem but how would heat and humidity be a problem? Ive lived in Florida my whole life and consider the heat and humidity to be much more intense in north central Florida, Georgia ,Alabama and South Carolina! South Florida has more mild winters but also more breezes off the ocean! For example it might be 96f 89% humidity in north inland Florida but on the same day Miami or Naples is usually 5 to 10 degrees cooler with 10% less humidity . This only applies to summer months. I thought chill hours would be a problem but you proved that wrong! It may be the very high lime content south Florida or tge hurricanes actually destroyed them!