Some ferals really just luck out! You are doing a wonderful thing for them. That's a lot of kitties to be taking care of! I'd guess that the ones who let you close to them are probably strays/abandoned rather than feral. I hope the little one who can't jump is getting her food too! Maybe you can work on her first to gain her trust, so she gets to a point where she'll eat with you there.
It's frustrating, though, isn't it, when you spend all this time trying to help them, and then they don't take advantage? I wish someone would come up with a raccoon- and opossum-safe way to feed cats...I'm trying to figure out how to scare off the opossum that are always coming around to eat my stray's food. I hate those things.