Yo dude, i would agree with the guys above in going with the problems just looks to me like an underdeveloped rootzone due to over-watering, especially if you say you're watering every other day to 10% run-off. If you've been watering as frequently/heavily since seedling stage then i suspect rootzone is underdeveloped, and it's suffering the over-watering issue on top of that. Your mature leaves look good & fine, it's only your new growth that is struggling to develop abit, which i would guess is too wet soil.
For plants of age/size of your pics, i personally would be giving them probably maximum 2L - 2.5L water every 3 or 4 days, and again at this stage i wouldn't be too concerned about run-off either - as long as you're slowly watering the whole soil surface it'll soak down fine till a dribble comes come out. Again, at this age/stage with you not yet adding nutes, there's no major salts build-up yet you need to worry about flushing out the bottom; if anything over-watering at this stage is more likely just washing the pre-existing nutes out the soil. Giving it some brief dry spells will help it develop the rootzone too, as it sends more out looking for water; atm it's got no reason to develop rootzone cause it's getting constantly soaked.
Your plants are also now the age where they'll be individuals with potentially different watering desires, so you may also have to be prepared to stop mass watering all at once and start watering each on their own individual schedule. It's good to only give them enough water proportionate to their size, so just increase in weekly increments as they grow and look to get good run-off once they're a few more weeks mature.