Depends how the fan is,(I cant really tell from image, is it a blow hole setup) want some air pressure to be hitting the plant and thus forcing it to work to stay up and grow towards the light, this should be able to be accomplished though with the intake fans. If they are not producing this result and you have a heat issue and really not much option besides upgrading. (I was not saying don't have a fan blowing on the plant, just make sure it's not counteracting with the other airflows)