jbp black pine decandle

Greetings fellow Bonsai brethren, So we’re entering Winter season and Im getting ready to prune/ pinch the needles to make room for the new growth. I have 2 5 year old and about 8 2 year old JBP. Can someone point me in the right direction and tell me if Should I remove all of the needles down...

Here is the set of seedlings I have. I am 100 days from the end of my growing season. I would like to grown 1 or two of these into a literati or windswept design maybe 12-16" when done and the rest I want to be shohin or mame sized. I am aware decandling will slow growth and slow trunk...