That makes alot of sense...right? I mean, my ends were really blonde too (and my hair is dark brown, with auburn highlights) It lightened and brought out my highlights all over but the ends were always lighter. I'm guessing that that part of my hair was always lighter because it had more damage. I snipped off somedamage and I also oil it a lot more so I don't have quite as much damage, and my hair is not as light.
Back on Cones,so now my routine is,wash with Deva No-Poo every other day or so. Occasionally use 365 sulfate free,maybe use low sulfate shampoo mixed with conditioner once every two weeks are longer. I condition with Aussie Moist or HEHH. I style with a little GF TN,and finish up with tons of GN Pure Clean Smoothing Cream. No frizz...slippy, happy hair.