Can't tell you proper siting in your area, but JBP is always associated with full sun, overall fairly dry soil between watering, and plenty of fertilizer.
The top priority on this tree should be growth. It needs more foliage, more buds, more strength. Don't decandle this tree; it is not strong enough, and not the right technique for this stage. My blog site has a couple
articles about developing this JBP using sacrifice branches and final branches, it may be helpful.
Pines can be rewarding, but pines in this condition are what gives them the reputation of being hard to work with.