Hey there Thai, well you see growth rate is regulated by the Vapour Pressure Deficit (VPD) and you're bang on the most optimal conditions + your lights are at the correct distance , this you can tell from the tight (and perfect !) Internode spacing of leafs' "levels" . These genetics' name is "dwarf" so you shouldn't expect massive vegetative growth, but if if I can I hope this puts your mind at ease. Hope this helps ! 🚀