The 400ppm Holy mentioned on your other post is on the 500ppm scale.
which is 0.8EC or 800 on your meter.
Keep this chart handy and check it any time someone says anything about ppm. This can be one of the most confusing things about multiple people weighing in and giving info in different formats.
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I believe you may have gone a bit low, but if it was overfed, a couple days in a light solution like that should help it. I run my seedlings in a very light solution like you are now and they seem to enjoy it up to like a month old.
The chart I posted back on page 2 should be fairly accurate for the rest of the grow, but I believe they are using calimagic in those and the seedling feeding is pretty hot imo. Calimagic is one of the lowest N calmags IIRC but its Mag isnt amazing and most of us use epsom too with it.
Your calmag is pretty N heavy and recommends a 0 dose for seedlings. Being that youre RO you need some, so id do maybe a half dose for the babies. and start with 1/8 tsp per part. It probably got that heavy hit of N and got locked out.