The Ted Cash cappers are one of the best made. The other thing you could try is get a cheap straight line for a #11 and then bend the neck spring in more so it would not spit out the caps when turned over. That is what I use. I loose a few caps now and then but like you pointed out... its a lot easier to cap the thing.
Also get yourself a loading block. That is the way to load these things. You pull the cylinder, wipe out the frame, and then set the cylinder on the loading block. Much easier to load and does a great job. Also if you have to load caps with your fingers, doing so with the cylinder out of the revolver is a lot easier.