I only feed with a feeder. I set up a baffel around my pump intake in the sump. When the food hits the tank upstairs, it is already "wetted" and looks like a fine mist in the water. I have also used a continment method like danmhippo suggested. If you feed into a pvc pipe that is just slightly in the water, the food will have to sink to get out. Then it won't all go out the overflow.
In my case, I have a refugium and 4 growout tanks in the basement all connected to a 135 gal upstairs. I don't feed the tank, I feed the whole system, so I want some to go out the overflows. I am making my own food and trying to simulate planktonic feeding. I want the food to move in the water column so everything has a chance to feed. I feed twice a day. I have fish, LPS, SPS and soft corals. I set it up this way as I travel a lot, and after trying it, decided to use the feeder all of the time. I am currently useing an Eheim and think it works very well.