I've upped feedings to five or six per day, because Nemo is still behaving like a nestling due to his issues, not really self feeding, and lost a little weight on just 3 feeds. He's doing well on more feeds and is more vocal and playful.
I was also reading through older forum posts that recommended not raising baby parrots singly if it can be helped. I decided that it was important for Nemo to have some socialization with other parrots to learn from example how to self feed, and just for constant company and to avoid him becoming too dependent on me. Lacking a second Quaker parrot and certainly unable to afford the price tag of a captive bred chick I picked up the budget alternative... a young budgie as a companion. Being a baby he's not any danger to the slightly older parakeet and he has responded very well to his presence in the brooder cage, preening and being preened and being more interested in trying solid food. He also begs the parakeet for food, allowing me to sneak in with the syringe and feed him more easily.
Though they will have to be watched as the parrot grows stronger the budgie is now fulfilling an important role in ensuring Nemo learns how to be a bird and does not become too dependent. I strongly believe in not keeping single birds unless absolutely necessary.