Smorf unless you don't have the room, like dudeski said just let her grow out, you can bend her back if you want or just untie the bottom and she will somewhat straighten herself out, branching is more common with certain genetics not everything branches some just want to be pines tree shape, some spruce like, while others are like a willow or a bush and just go everywhere once they hit a certain age/height, for reference i only train if i need to keep things under control like i currently having to due to my plant count with my genetic hunting, if i was running bigger pots id be topping and training to fill out the space while trying to keep them short due to the amount of root space, but saying that a lot of plant structure comes from its genetics, knowing what to do just comes with experience and playing around to know whats capable.
Now that aside, you might be underwatering, it's a guess but it's something i might have been noticing with the pics, hard to tell without being there and feeling the soil/mix but saying that i would have roots busting out of the bottom and sides like crazy at 33 days, usually i have roots throwing out the bottom and sides even with bigger pots by 14-21 days, i would try watering more like double the amount at least and then let the pot dry out to the point where say the top 1/2" of soil is dry but just below that its moist to the fingers. And make sure you have the full pot saturated the same. Your soil/mix with the perlite looks like can easily shed too much water if you overwater so go for it.