The lower branches grow rapidly to compete for dominance ( the tallest branch ), everything chases the light, including the main branch that will often times be pointed upward to the light after a day. After about a week your plant will have multiple tops that will easily be managed by additional LST. Now you no longer have a xmas tree.... you have a Bush!
I leave the wires in until the plant pulls them up out of the dirt, then I cut some plant ties and tie them down to the side of the pot. I keep training my plants like that until buds set. Training your plants = much greater yield.
All good things... lol