6 to 8 inches of candle on a tree is a lot. I've seen more, but that's a big candle.
How long are the others?
If your trees are where you want then, and you want to start refining them, then break those long candles in half. You'll be removing them completely in a month or so, but by shortening them now you will be directing some of the trees energy to weaker portions of the tree. Part of "balancing".
If, on the other hand, you want to build trunk girth, let them be.