Nothing will work miracles with one use....it's all about consistently providing the moisture to your hair. I think you should try wetting it every few days, not washing, but massaging your scalp to remove build up, and "washing" with conditioner only. Then after you turn off the water, put more condish in, seal with oil, then add your smoothie.
If you're so frustrated that you're considering going back to relaxers, it's worth a shot....right!!!!???? You have nothing to lose, and everything to gain.
My hair would be drier than the Sahara if left to its own devices for 2 weeks!!! Of course, my scalp would be an oil slick, but that's another story.