I've decided since Chrome is playing hard to catch that I'm going to feed him outside of the pen. This also helps keep Galaxy out of his food. So now if he wants to eat he has to be caught, haltered and led out, then he has to follow me while I feed Galaxy then he gets to go eat his food while I groom him or work on desensitizing him to a swinging lead rope.
After he eats I'll take him back to the paddock and work on more desensitizing. I've been swinging the rope all around him and waving my hands around. If I do this everyday it shouldn't take long for him to stop being so jumpy. He calms down very quickly, so I don't think he's actually scared, he's just very reactive to movement. I'll keep you updated. :)