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Citrus fruits can take a long time to ripen. This article is about lemons, but the advice applies to all citrus trees:
https://www.gardeningknowhow.com/edible/fruits/lemons/lemons-stay-green.htm

Some non-commercial varieties of orange can have greenish skin when ripe- try one and see how it tastes.

Also check this article in case your tree has symptoms of citrus greening:
https://www.gardeningknowhow.com/edible/fruits/citrus/citrus-greening-disease.htm

It could be that the soil is fertile, and extremely well aerated. This would cause them to shrink some, as the soil compacts itself down over time. It will not hurt your trees. Here is a link to several articles for citrus care: https://www.gardeningknowhow.com/edible/fruits/citrus/

You most likely had a grafted orange tree, meaning the top of the tree was from a different variety and had different genetics from the roots of the tree. The rootstock (the variety that the roots came from) has now taken over and is producing the inedible fruits.

Talk to an arborist or a university extension agent to see what can be done. You will probably have to replace the tree. But if there are still a few oranges being produced on one section of the tree, it may be possible to cut out the sections that are producing "lemons" and help the oranges take over again.

This happens when water and sugar move too quickly to the fruit, causing it to rupture. Here is an article explaining why, and what you can do to correct the issue: https://www.gardeningknowhow.com/edible/fruits/oranges/oranges-splitting.htm

I did a little research on Powerfeed. There doesn't seem to be anything wrong with giving the tree this. I feed my citrus, and in fact, all of my plant both edible and not, with CYCO. This is a fully liquid line of pharmaceutical grade nutrients. It is far from organic, but I know it is clean, and pure.

Bottom line is: You don't have to use citrus nutrients. They just take the guesswork out of knowing how much, and when to feed, since the NPK ratio is geared towards citrus.

If it acts properly, and grows vigorous without sacrificing fruit then it is fine for the tree. But make sure you know when to cut back on the Nitrogen or else you may not get fruit.

Osage orange is reported to have an average 75-year lifespan, although some individual trees live longer. So it could just be coming to the end of its lifespan or its fruit-producing years.

Here are some more general reasons a plant may not flower in a particular year, and thus may produce no fruit:
https://www.gardeningknowhow.com/plant-problems/environmental/plant-not-blooming.htm