Some of the candles have good size but the needles are really short. That can happen when the tree was stronger the year before than it is now, and is common after a severe repot.
What most concerns me is the color of the foliage. It appears dull in hue and somewhat yellow - is that the case or just the photo? Also curious if you've checked for spider mites.
In short, I'm with Justin - I'd hold off on decandling until the tree is really healthy. Some cutback and needle thinning would be good in fall or when the new needles harden off.