|You know, I'd stick with what you're using, albeit possibly less of it, until you have a reason to switch. One thing that can help with front loaders is to trick the machine into using a little more water (I know, this goes against the reason I bought a front loader, but it's still less than a top loader). You can do this if your diapers are wet, as they might be in a wet or damp pail anyway, so that the weigh more, and thus trigger the sensors to think it's a larger load. If you do a pre rinse/wash, you can select the "no spin" option to leave the diapers wet, and thus go into the next cycle heavier (suspect that works only if you are manually changing cycles, not if you pre set a prewash-main wash in one go).
I've always used a front loader with our diapers and really haven't had many problems. I did find it useful to do an occasional sanitary cycle, but I suspect that's more because of our on-demand water heater that makes it a little harder to have consistent hot water for a hot load.
One thing that is important with a FL is to leave the detergent drawer ajar, and also the door itself, to keep away mustiness. I have a little soft doll that I just sandwich in the door to keep it from closing all the way.