Royal Dwarf 2nd Grow

Hello there ! Another friday-another update (depends on where you live) Lil infants made it to week 3 but i must say i am not completely satisfied. The overall growth seems to be going very slow, as opposed to other diaries and as i can recall even to my own previous. While trying to figure this out during the week, I raised my led system about 20cm further and added some more soil/perlite mixture for number 1 as to support it better and maybe to encourage some additional root growth. Why did i distance the light further ? While the distance was 30cm from the infants, i noticed that the pots started to get a lil bit warmer than maybe they should and hence during watering the soil would evaporate too soon. I will be making soon another led fixture to replace this one as i might know or guess at this point, the culprit in this matter (the fan is blowing downward through the heatsing instead of drawing air upwards). I did notice some additional leafs forming after these changes but still it seems going too slow. Other than above mentioned; nothing has changed. Temperature is steady most of the time and precise. I am thinking hard enough and i admit that no good or more productive ideas are surfacing so far. Everything should be better than the last time on my first grow: Light during the whole vegetative phase was then one 15W bulb, then two and maybe three altogether during the vegetative growth and no ventilation whatsoever. As opposed to now when there is intake and outake fans and a 117W led from the start. I am missing something i know but i dont get it. Oh Yes ! The only thing i am not sure about is when do i start to add nutrients. On my first grow i started right away as i got them when She was well beyond the vegetative phase and the She was big so no confusion there. Biobizz states; "Start using fertilizers when your baby plant is 10-15 cm or has 2-4 leaves" These infants are not 10-15 cm so scratch that but they do have 2-4 leaves. I want to be careful with this as i dont want to burn them and slow down growth even more so hmmmmm. As always, dont be shy as i am very open to advice. Well, until next episode; have a nice weekend and be good to each other