Desfrán for spring

D-70 : At this stage, I'm a bit.... surprised that the Desfrans are not taller thant they are. The smallest one is 35cm wich is really small for a 100% sativa strain. The tallest one is about 56cm, wich is also quiet small I think. If I compare with some other diaries, the tallest one could be in the target if we take into account that I trained them a lot during their first weeks. But the small one is almost the half she should be... There's no sign of deficency, none ! I have 420w @ 50 cm from the top, so it's not because of the light. The container is a 20L smartpot. I simply do not understand. Is it juste because of that phenotype ? Will she grow during the next 7-9 weeks untill she'll recover her late ? I Modified a bit the position of the light so the Lumatek 100w FullSpectrum on the side of the box is really pointed to the "slow" girls. We'll see if it change anything but I really doubt about it... The only lead I have is : Desfran loves HEAT and Light. The 2 smallest are on the coldest side of the box, even if it's not cold at all. But it is the side near the window...