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There are no feeder roots near the trunk, and the large roots will not take up water. They are only for stability.

In order to deep water, you will have to move out from the tree several feet, and then water. Sometimes it can help to bore a few holes down into the ground to let water penetrate through tough soil if this is the case.

This article will help: https://www.gardeningknowhow.com/edible/nut-trees/macadamia/how-to-grow-macadamia-trees.htm

It is most likely that the tree is reaching an age that will not allow it to produce healthy fruit. They will often drop what they cannot support. It may be that you need to fertilize the tree, as the soil can run out of nutrients over time, especially if it is not fertilized annually.

This article will help you with the care of these trees: https://www.gardeningknowhow.com/edible/fruits/figs/fig-tree-is-producing-fruit.htm

Macadamia are typically trees, but may have a shrub form, although I've never heard of it.

They are a subtropical and tropical region plant. So if you have a shrub growing and surviving through a winter outdoors and producing nuts, in Omaha Nebraska, I suspect that it is not a macadamia.

The short answer is that 1.13% phosphate (P2O5) is not high in relation to the 2.6 for N and K. On that basis you need not worry about bringing down the P. In fact you might try to bring it up.

If your primary mission is to grow macadamia nuts, then of course it is far superior to test the soil and get agronomist recommendations for an Rx of mineral and biological amendments, based on actual defficiencies found. The general purpose fertilizer is OK, but may not address the actual needs for best plant health and productivity. And of course there are other factors in good soil and water managment, mulching, flood irrigating, legume green manure intercropping, no deep tillage to disrupt absorbing roots, etc., all these and more to be considered.

https://www.gardeningknowhow.com/edible/nut-trees/macadamia/how-to-grow-macadamia-trees.htm

That tree has already been shaped for production, it seems. There is no need to prune, unless you are taking out diseased branches. This should be done closer to the end of Winter, or start of Spring.

Keep in mind, they take a very long time to produce, and in container will be longer if they fruit at all. This article will help you with their, general care:

https://www.gardeningknowhow.com/edible/nut-trees/macadamia/how-to-grow-macadamia-trees.htm

There is lots of information for you on the cooking websites, and you can find a macadamia nut cracker online or in fine kitchen supply stores.

This resource is for free gardening information.