Thats what I also dont understand, as Iv mentioned earlier, my other plants are much closer to the light and doesn't seem to be affected at all.. I dont have a temp. control setup yet, so i dont know if Im operating at too high temps.. I have flushed this particular plant once and noticed the water draining was rather yellow.. Can I flush as much as needed or will over flushing deprive the soil of maybe valuble nutrients? Also this plants leaves are much darker than the rest, does that maybe have summin to do with the fact that its burning? Iv stopped giving N2 as soon as Iv started flowering, my N P K ratio at the moment is 25-92-35 i think, but have stopped fertilizer treatment, worried that the rest might also get burned..
its a crap shoot man, now that ive seen the last pic you put up it could very well be just a weak plant, as much work and care we put into everything theres always one or two that just dont get along as well as the rest, has it been this short since veg?, if so then you might just have a weakling, and if i remember correctly you said you did some topping for three colas? it could be that it was done a little to close to flowering, also the number of individual leaves on the fan leaves is a decent indicator of overall strength/ growing conditions.
In my experience ive had the same genetics same conditions and the majority of them had 11-13 leaves each but there was
that stragler that was last to germinate last to show sex etc.
overall diagnosis: possibly weak seed/genetics, heat stress experienced by this particular plant, possible fusarium wilt but after seeing the pics i would say it looks healthy minus the lack of vigor, a good flush is definetly in order followed by a lower concentration of nutrients.
and to answer your question regarding the flushing, if your using an inert medium (ie no soil or organic nutrients present) then no there wont be any nutrients lost because the new solution will replace them, flushing will rid the soil of the excess salts that build up in the root zone that prevent the uptake of nutrients into the roots, so definetly flush with ph balanced water ASAP then see where it goes.