You are correct. I would not start training yet. As your girls a a little small .My labels are the stones rose quarts pyramid is amnesia auto has a heart stone that you probably can't see in pictures n the green stone is berry white. I read the article on training. I'm very nervous to manipulate my plants as this is my first ever grow. I just feel my plants are still too small.
I think you would be better off working on watering, nutrients and lighting.
Get them growing well and you can always tie them over just before you put them into flower. What do you think of that as a plan? I can help you with anything you need along the way. @Amazingvitality ?
Also I love the stones. I have a tigers eye in one of my domes.
Bill