Japanese Black Pine candle question

Hey guys, I've got a few JBP on my bench, all getting the same treatment more or less, although the last one I got was looking pretty sorry at the nursery.

I decided to get it as it had great branch options and a solid nebari developing already, figuring if I put it with the rest of my happy pines, it would come back to fair health.

However, since the candles began extending, I've noticed it to have super abnormal, and leggy candles growing, so just wanted to see if Josh, Andrew, or anyone else in the community might know why this is happening and how to go about making it happier and healthier.

I've uploaded a couple photos from different pine trees I have for comparison, and the tree in question last.

Thanks guys