That is close to my recipe with added ingredients, except I use one cup of everything. I've never added oxyclean and I actually do the liquid formula because we prefer liquid.
I think that you should give it a whirl. I've seen so many different recipes, I don't think exact proportions are too critical.
I've noticed at my workplace where I do laundry for a veterinary clinic, oxyclean takes out color from stitching and logos and such. I'd be a little inclined not to use that product on general laundry, rather just add oxy clean to particular loads when needed.
I've also seen bleach added to these recipes and felt like why add that when you could just add it to a particular load? When I'm making laundry soap in bulk I want it to work for everything. But it depends on your needs......that is the beauty of making your own.