New Hampshire? That means winter comes sooner for you. Which means that after you decandle, the new shoots have a shorter time to grow. So, all that means you should decandle EARLIER in the year! I decandle on July 4. You should decandle early to mid June!
Ok, to build foliage closer to the trunk, there’s a couple ways to do it: one is to let it grow and get strong, and then cut back hard! I believe that what you are attempting.
The other way is to wire the tree out, pull unnecessary needles and decandle. This is the approach I generally take.
Your approach works best on really rough stock. If I remember, your tree already had a bit of style already. But that’s water under the dam!
When you cut back you have to leave some green on the branch. It will not pop new buds on a bare branch. (Like a Trident maple will).
Sunlight must be able to hit the woody branches. Lush terminal foliage will block the sun. The stems and twigs will be shaded. There’s no reason for the tree to pop buds where there’s no sun.
That’s why my wiring out method works. When wired, the needles get forced to point out, not up. They no longer shade out the branch structure. Back buds can form at the old internode joints.
Decandling aids in this process, too. Repeated decandling shortens internodes. If you don’t decandle, you get long internodes. So, a tree that has been decandled repeatedly in the past has a lot of short internodes, and internode “joints”. It’s from those joints where backbudding usually occurs. Yes, there may be some old dormant buds that were between a pair of needles, but these are very weak, and rarely pop on old wood. Whereas budding from internode joints is quite common.
So, you state that you are trying to bring foliage in closer to the trunk. That, my friend, IS refinement! Refinement techniques will produce the result you are looking for!
Good luck, and if you are decandling this year, do it sooner rather than later!