With brown, dying tips, I'm thinking this is fert burn, especially since it's Advanced. Seems like people have difficulty using this brand. I think Jessie's problem was also too much fert, but I don't know what fert he was using. When I read the words "DWC with Advanced" in your post, I thought Well, that's probably the problem right there. I didn't see your use of a ppm meter, so if you're not using one it might be smart to do so and get your ppms down some and try to keep them there at least for a while and see what happens. Measure your current ppm and don't get close to it again.
If you want to try a different fert, I'd suggest Dynagrow 7-9-5 at the grow shop or online. Just don't add it to Advanced, but make it a separate fresh fert and water mix. This is a one-part fert and has all the micro nutes plants need. Just doesn't have a very long shelf life. PPM around 600 for babies and raise it a little if they yellow. 1000-1200 or so for adult grow. Supernatural Aqua is good too. Just be careful cuz crystal ferts are stronger than liquids.