Hi Leslie,
These look pretty good now! They seem to like your attention. Hm.. My 2 pennies..?
I think the planting is ok. Next time, I would not take a mound to spread the roots out over; Rather, I would keep them as horizontal as possible. Naturally, the root radiate out from the stem evenly in all directions, right? Surface roots add a lot of character to the tree, so the first few cm of roots I would keep fairly horizontal, maybe sinking 1 cm for the first 4cm of root. As the tree matures you can place the tree a little shallower, and the first cms of roots will be visible. Also, I try to keep a bit of movement in the roots; Think a dense forest with loads of roots: They are hardly ever perfectly smooth. Often they appear and disappear a few times.
As for pinching back.. I am not sure what your objective is for the tree. You *could* pinch them back, and start with a bushy tree with loads of side-branches which you later remove. Or you just let them grow wild for the next year or two; THat would create the trunk faster. But would give you a bigger scar to deal with. By letting it grow wild, side-branches should develop by themselves without taking the top out. Branches add to trunk thickness, but mainly serve as an assistent to add taper.
If these were my plants, I would remove the growing point when the tree reaches 50-80% of height I would like to reach. Then I would take 4 or so branches that appear, and let those grow out. Other branches I would keep removing as soon as a bud appears on the trunk. One of the 4 branches I would push vertical, to create the elongation of the main stem, and here I would regularly remove to growing point, to keep it slender and short. The other 3 I would use to create taper & thicknes. The more biomass the plant has (Particularly leaves), the faster the plant will grow (!)
Once the trunk has reached the thickness you want, you clip all three branches away, as smooth with the trunk as possible (Ideally: A little deeper, so the scar heals over smoothly. The leader you also trim back, to maybe 20% away from the height of the tree. Then you start building branches. That is also the point at which I would start considering bonsai soil as you have better control of nutrient availability. I would still give the plant lots of rooting space. Only after you have the main branches set up, and you start working on ramnification I would place the plant in a smaller pot.