I too am growing this strain, along with a couple of other auto strains. I have been growing Lowryder 2's for about a year and a half so I have some experience with autos. You are correct in what you said about them being different than other strains with nutes. I don't add anything until the 3rd week (except thrive alive green), I use bio bizz all mix soil, and I use Earth Juice nutrients. When I do start to add nutes I try to follow the guide written by the Joint Doctor (the creator of Lowryder strains, see link below). I did use the Dyna-Gro Grow and Bloom nutrients when I first started out but I like the organic nutes alot better because they won't burn your plants and they don't contain any salt building chemicals.
http://www.420source.com/post/207