mike is right; CBS and other spruce will bud-back readily when newly extended shoots are cut back after june. I have 2 and I'm getting bud set on the trunks.
Giga here's a video the shows how tough these trees can be re: root disturbance of seedlings and 'teens':
so I think you're ok with what you've done...not that you're concerned anyways.
I'm surprised that's not a graft; I know Norway and white spruce was/is widely used as root stalk for ornamentals like blue spruce cultivars..but pictures can be misleading...and many CBS are avail. from seed.
I made some selective pruning on mine as well, shoots will be pruned in july, bud set in fall and I should be able to push the growth back.
I like the grow boxes you've made; soil mix looks good too, lets see a shot of the garden; looks like there's some nice projects going on