How do we get one of our feral kitties to not go spastic everytime we come around?

You should be caging them in a kennel type dog cage. Put them a box with a lid and a blanket--with a whole cut out so they can hid if need to, water and a litter box. They should not have a room to run if they are not friendly to you yet. Everyday, put food in and hold and pet them often. Every hour for a few minutes. Lengthening the time you hold them as they get used to it. Make sure you pet them while you hold them close. When you leave take the food. When you come back put the food back in. Once they get used to you holding them and come to the cage door to greet you then you can start letting them roam around the room while you are in there and put them back in their cage at night. If you do not have cage you should use the smallest room poss with the least amount of stuff in it as poss. I have feral kitten and have tamed him and now he is my social holly terror! Good Luck!