I start in the middle of the smoothest brace height, then tune shafts and if needed slightly adjust brace for maximum tune. Brace height adjustment after a pretty good dynamic spine tune gets the arrow coming off the string at the proper time, when arrow is in line with target, that yields the quietest arrow off bow for me.
All the arrow tuning has been out the window with the arrow dynamic shafts, as Terry has said just cut them and shoot, but I found brace height adjustment after this yields a smoother and quieter shot.