I have 2 suggestions, and I think that they will help you. First, Julie Goodnight had a great program using your brain, and some body language. Here is a post which has her advice, but this particular program (on RFD.tv,) is really worth watching. Julie Goodnight Natural Horsemanship / Horse Master TV Show
Also, my own experiences are helpful. When I first bought horses I had a small herd. They were NEXT TO IMPOSSIBLE to catch, at least catch quickly. I felt like a fool running after them. It occurred to me that I might be able to get one or two to the gate if I took them outside of their turnout and fed them their grain tied up. I was right. The first horse to respond was in the middle on the herd. The NEXT day, it was my herd leader. I made a science of it. I demanded that each horse put his head over the gate and waited to be haltered before he/she could exit. Then I led said horse to his own spot to eat grain from his (rubber) bowl. Soon, each horse would obey and they'd exit the turnout in pecking order. I would return them in pecking order and I demanded that their head was over the gate before the halter came off. I did this for 14 years, before I got a place with them in the backyard, and they NEVER forgot and I NEVER had to chase them again.
I have been doing the same with my 5 yo colts today. After just a year of this they wait patiently, with a slack lead rope, with ME safely on the other side of the gate before they are released. IF one doesn't come right to the gate for ANY reason, I make sure to give the others a special treat within the "bad" horse's sight, so he can watch. The next time I don't have the problem. Hope this helps. I think it was the smartest horse training I ever did. =D