That's why you got nute burn in the first place. You don't start nutes on a young plant until they are between 2 and 3 weeks of age, depending on your growing medium.
I started feeding after 4th set of true leaves according to seedling stage on an calculator. Then after 2 weeks, you start veg cycle. This is week 3 of veg cycle for me.
* Not to say that the AN calculator is a great reference *
PS. I just re-potted in 2 gallon pots with promix HD soil. I was able to gently remove a good portion of the old soil and they are sitting nicely in their new containers. I then gave a generous watering with Iguana juice at 1.75ml/l. directions on the bottle say 3.5ml/l...... I sure hope this helps.
Thanks for all the advice,
JJB.