Kabhyper - it sounds to me like 'star gazing', which if I'm remembering correctly is a form of wry neck and is usually treated the same way. Silkies are prone to both star gazing and wry neck, which explains why only your Silkie chicks are affected by it.
First of all, if they are on medicated feed,
take them off it now as this can make the condition worse. The Amprolium in medicated feed is a thiamine blocker, and having a deficiency of thiamine (or vitamin B1) is one of the causes of this condition.
They need vitamins E and B1, and Selenium to aid in the absorption of vitamin E. This post has a dosing regimen in it that was successful for this person's bird:
https://www.backyardchickens.com/t/...ze-updated-with-great-results/10#post_4698410 There were also suggestions of natural ways to provide them with these vitamins (was it the raw liver?) a few pages back, if you prefer. I don't remember them--I hope someone else can chime in here.
ETA: The raw liver was a natural source of vitamin B. I don't know if there is a natural way to provide them with vitamin E or selenium. Best of luck!