Good luck with that stubborn and getting some chicks.
Chick down has worked for me also.

With newborn stubborn feeders I will give them a couple weeks without offering anything with little disturbance as possible. I have found that the more you leave them alone the less weight they drop. So feeding trials are spread further apart to reduce stress. If I am not being completely clear let me know and I will explain further.

Good luck!!
-----
Charles Koutris