The best thing you can do to keep Bobwhites calm is to put in hidey places for them. Bobs need to feel secure and safe. They flush easily. So add some branches to the pen or aviary. I keep my Bobs in an aviary style setting and use brush piles and fake Christmas trees for cover. If you keep them in a pen style set up, prop tree branches up in the corners or anywhere inside the pen. Make a jungle in there. This will calm them down. Bobs don't like to be exposed to the outside.
Of course treats from you will help them bond with you, but Bobs are very flighty by nature and you will need to offer them security in a natural way.
Also, keep them out of high traffic dog or kid areas. This will help them as well.
Good luck with your Bobs.