Pines are notorious hissers, they "a modified flap in front of their epiglottis enabling them to sound off a loud gutteral hiss". My '09 female hisses from time to time, but not as often as when I first got her...same with the tail vibrating. Never bitten or struck either.
To get them to eat F/T, I would put one in container with F/T mouse and leave them in there overnight if you have to. If he/she doesn't eat, I'd wait another week and try again, repeat as necessary...within reason. After a month of refusals I would have to rethink it!
Mine doesn't have a strong feeding response, but she's always eaten. If yours has eaten F/T before, I would think they'd accept them again if they are hungry enough.
I don't house snakes together, but from what I have read on the Pines, you can probably get away with housing them together if they are the same size or close without any problems, don't feed them together! Maybe you can come up with a tank divider?
http://www.homegrownherps.com/Care%2..._pituophis.htm
http://www.kingsnake.com/pituophis/care_group1.html
http://www.neherp.com/care-sheets/38...ake-care-sheet