http://www.funnyfarmexotics.com/PALM/Chapter8.htm

Try this Palm Cockatoo SSP Husbandry manual's chapter VIII -Hand rearing and medical care for young palm cockatoos. I have no doubt to the our old timer breeder's 'proven' fomula - Nestum+egg yolk as there r many success story in raising baby parrots in the past & present. But somehow now u r dealing with 2 precious baby palms and has been waiting for 15 years. Do some research and make the best decision. Good luck man.

Is your pairs Goliath (26"-27") or atterimus(18"-20") nominate species.