I guess I missed what your goal was. I'm stunned that after several suggestions that I thought were correct technique, to not pull needles, you pulled most of the needles. Your trees are too young and too small for the work you are subjecting them too.
We'll see how much growth you get this summer. You might get by. Feed the heck out of them and lots of sun for the summer.
My many failures with JBP when I was in my earlier learning curve about JBP is that I did not understand or have a good concept of what a healthy vigorous JBP looked like. For years I thought a couple weak candles and mediocre, lack luster growth were "good growth and good vigor". I would then work on my weak tree and over the course of a couple years would work them to death. I killed a dozen or more JBP this way. Then I visited some "real" experts at growing JBP (Jack Douthitt for one), and visited them before de-candling time. Wow, what a difference. If you don't have big, bushy fox tail like candles everywhere, your pine is not vigorous. When a JBP is in development you got to keep them bushy to keep them vigorous. For a tree in development you don't pull needles, and you don't necessarily decandle them. If you have enough branches, then there is no need to force more branching by decandling, so don't decandle if inducing back budding is not an issue. Decandling is a stress, it should not be done unless it is needed. If you want a trunk as thick as a soda can in less than 15 years, you need to keep all the needles you can.
The lack of response by others is likely stunned silence.