Topped her and bound her down. After the intitial tri-leaf phase she seemed to normalize. I topped her right above the last tri-symmetric node, resulting in 6 branches overall.
I also added the temperature and humidity graphes of the last seven days as pictures.
Hm I just chopped a Tangie that was normal, but my current Sour Diesel seedling is also tri-symmetric :)
Good luck with your plant! Would be interested to know if you notice any differences in how a plant with this mutation has to be cared for compared to a regular one. I started feeding mine higher levels of nutrients and more light earlier than advised because hey, 1.5 times # of leaves leaves translates to 1.5x photon capture surface, thus 1.5x available energy and capacity for nutrient uptake, theoretically (I'm not a biologist, so maybe some of my assumptions are wrong).
@tangie, thank you for your comment. For now she stopped the tri-symmetry after the 2nd node. But it doesn't seem like she produces more biomass than the rest. So I will feed her like the rest for now.
Also, after the topping she look quit freaky (which I like c:)