For increased branching, you can pinch off the growth ends, or even pinch off lower down to shorten the branches. Looking at your second-to-last picture, you could prune the branches on the left main branch more severely than on the right (for example, prune 2-3" off each branch on the left main, while pruning say only 1" off the branches on the right). Longer branches with more leaves on the right will cause more energy to go to the right, and the branches there will subsequently thicken more. Eventually the left will look more like a branch than a twin trunk. Best part- if you make a mistake, it will be covered by new growth eventually. :o]

(If you don't like this advice, the smart people will be along soon enough)

ez

Keep in mind that if you prune extensively, the plant will consume less water and need to be watered less frequently.

ez

I am considering just cutting off one of the branches down to an inch or two.

Jade pruning threads are my favorite!

Just cut off the left portion of the Y. Then use that as a cutting to start another plant.