Nute burn or overwatering?

Hi guys,

Could you please have a look at the pictures below and let me know what you think. The plants are 22 days old and they have not been watered in about 3 days. Temperatures are staying at about 29 degrees.

I'm using biobizz allmix soil and they were transplanted into bigger pots about 3 days ago. The yellowing appeared about a week ago and weak feedings with biobizz grow (high on N) did not help the problem but they were never this bad. I may have overwatered in the past but definitely not in a while because the soil was dry when I transplanted.

The soil PH is less than 7 and the water was about 6.8 (the water PH is quite high but the biobizz grow brings it down to 6.8). I was going to flush tonight but I tested the water and the ph is 9 so I'm not going to flush until I get some PH down.

I'm thinking nute burn because when I transplanted I used a very unscientific method of measuring the amount of nutes (i.e my eyes) plus I threw in a small amount of epsom salts for good measure. However, I've been looking up picture examples of both nute burn and overwatering and they seem quite similar.

Help!!!! :(

I personally dont think it is nute burn. I'm leaning towards nute deficiency maybe nitrogen. But, lets see what others say

over watering is droopy leaves you have either nute burn or N deficiency so i guess its nute burn if you didnt measure not a good way to do things

suspect you was doing the right thing by feeding it as it looks like it probably is nitrogen deficiency but think you are expecting to much, once a leaf turns yellow it will not come back green you may notice the newer growth at the top of the plant to be slightly darker green but the old leaves at the bottom of the plant at best will remain about the same or if you are still not feeding it enough may continue to yellow and may move up to the next set of leaves.
nute burn and yellow do not go together if you ever have a nuteburn problem it will not result in yellow leaves the first signs of nuteburn is usually brown or black at the edges of the leaf and in more severe cases the leaf will curl under and most of the leaf will turn brown or black there will be no yellowing stage.

Thanks very much for you help. I'm glad I don't have to flush right now. I really need to get my hands on some ph down for my water.