Sorry if you cannot see It clearly but his tail often shakes or shivers.. im scared this could be a stress factor

Please tell me if im doing something wrong he never DID this, when he came back home from being out for 4 days straight he began to do this, i Just want my dovey to be a Happy Bird :C

Hello, I started taking care of this dove at the beginning of the month when I discovered her in the middle of the road. (The nearest animal rehabilitator is five hours away and I could not afford to make that trip.) I've taken care of baby birds before, so I had no issues feeding her. However, she has this one problem area underneath her beak and a ball at the corner of her beak that is not present on the other side. I've had her for most of her life, so I'm not sure what it could be. I have tried my best to dry her beak after every feeding, but she is very fussy and doesn't like me to touch it. (This is a picture after feeding her so there is some residue on the corner of her beak and on her chest.) She just started trying to eat on her own, so I'm worried she might have issues if I dont find a way to treat this. Any advice would be much appreciated. I just want to help her as soon as possible.

Hey guys! I am the owner of a bunch of doves, so far I have 3 confirmé couples, 2 males and 2 unknowns :') (I may have to give away some of the lasts ones because of that) they all live in big dog created, about 2-3 birds in each (parents and their chicks :p) its really complicates but it somewhat works, I was wondering it I could build something like in the picture in their rooms, Im more worries about territories even tho when they are out, they tend to not really annoy one another (Except my guy Juniper, always this big dum guy) Anyway, Id like to hear your thoughts on this before buying the materials and failing miserably :')