Hi! You aren't missing anything, your soil seems to be greatly improved if you started out with compacted hard, red clay.
As recommended, I would put in a crop of a legume (or, dig in a legume plant as green manure). Or, just keep putting on your leaves. This would improve your CEC, which could be why you aren't seeing the growth you want. Your CEC isn't given as an accurate reading, which probably wouldn't have happened because it isn't a wide scale agriculture area, by the looks of things. Your tests say is is greater than 9.0, which really could mean anything. Though, anything above 10 is preferred for plant production.
CEC measures the exchangeability of certain nutrients and minerals (calcium, magnesium, hydrogen, sodium, potassium, zinc, copper, manganese, and iron). Compost, if you want a reference point, usually sits around 37.5. The only way to improve accessibility is to add more organic matter.
Improving soil is a long process. Depending on how deep the samples were taken, you may need to remember that certain plants may be putting roots down even further than where it is being measured, into soil that hasn't felt your hard work yet.
**edited to correct spelling of "zinc"