Look, Put that damn thing outside in the nature for about 2 weeks, let the wind and weather get ahold of it, but if you don't want to do that then what you need to do is set your fan kinda far back but where it's blowing really good.
Then you need to move the fan around the plant like every day, so it won't just be blowing one way.
But ya my stems were small but I let the N.C. wind get ahold of them bitches and oh ya the stem got huge!