I used the 1/4" wheel, which is too big for the teeth on my chains, so I will use it for the rakers. I set the angle to 80* (which is the angle specified on the box the chain came in) and found one raker that was set 0.030" below the tooth and used it as a gauge to set the depth for the other rakers. I went around the whole chain and some of the rakers never got touched and others took a bit off. I think after using the new sharpener a few times I will get the teeth and rakers all uniform and then I should see better performance from the chains.
I like the new sharpener but will likely still touch up the chains in the field and only use the bench sharpener after a few hand sharpenings. That way the electric sharpener can bring everything back to spec and make all the parts uniform. Judging by the varying length of each tooth and the varying depth the rakers were set at on my old chain, I need something like this new grinder. I think this new tool will be a very good investment.