New growth looks better than the lower leaves, so I wouldn't panic on her yet. The old leaves look like they took the hit when the feed/watering got out of rhythm, but the center still has life.
Since she's in coco, going too light on the mix can show fast. Coco doesn't feed the plant like soil does, and it grabs calcium/magnesium early, so a tiny plant can look hungry or locked out even when you're trying to be gentle. I'd get back to a low EC but complete feed, pH around 5.8-6.0, and keep the drybacks reasonable. Not soaked all the time, but don't let coco turn into a dry brick either.
That watering ring is handy once the roots fill that pot, but right now the root ball is still small. I would hand water around the plant for a bit, maybe a little wider each time, until she grows into the bag. If the ring is wetting a big area the roots aren't using yet, it can leave the root zone uneven and slow.
The extra fan is good, just don't let it sit there blasting the seedling at close range. Gentle movement is plenty at this size. If the new growth keeps coming in cleaner, those ugly lowers are just history.