I had the same problem so I made a feeding ring. In the picture the inner ring was a little out of whack (not fully hitting the water, but I'm sure you get the idea). I started with one big ring, but I found that my more aggressive feeders would hit the surface and pellets would still make their way into my overflows. Having a ring within a ring helps prevent most pellets from ending up in my filter socks.
I built mine out of clear tubing and some barbed T fittings...works well. You can make it out of black tubing so it's a little more discreet...now that I'm typing that, not sure why I didn't use black tubing...
As others have mentioned, using sinking pellets helps, although not all sinking pellets live up to their name.
I built mine out of clear tubing and some barbed T fittings...works well. You can make it out of black tubing so it's a little more discreet...now that I'm typing that, not sure why I didn't use black tubing...

As others have mentioned, using sinking pellets helps, although not all sinking pellets live up to their name.