The jitter can be caused by a few things. If you think it was definitely caused by rebinding, try to rebind again with the transmitter a little further from the plane. Another thing that can cause jitter is if your servo linkages have a lot of play and/or if you have particularly large control surfaces. For example, some of my cheaper servos would jitter on my FT 3D, which has very large aeilerons. In that case I found that my linkages had a bit of play in them, so I switched to a slightly larger control rod diameter and that helped quite a bit. A little bit of jitter is usually fine though.
Regarding some channels not working, make sure it’s those channels and not your servos. Move a known working servo to one of those other channels. If it works, then your other servo is connected backwards or just bad. If it doesn’t work with the known working servo, open the channel monitor on your transmitter and make sure that channels 1-4 are all sending the signal. You may have accidentally remapped something on your transmitter.