It probably just dried your hair out more than you were able to moisturize it with your normal conditioner and leave-in. I've never tried that shampoo, but it might also be just particularly drying even though I know it has natural ingredients. Next time you shampoo you can try deep treating afterward, and like you said using a heavier oil.

I'm almost positive that Aussie Moist has silicones in it, so you might have a build up problem in the future and need to shampoo.
Fine Texture, Normal Porosity, Normal Elasticity. Dyed to brown a few months ago.
Lowpoo:
Trader Joe's TTT Shampoo
Rinse Out:
Yes to Carrots, AOHR, Aubrey Organics Rosemary Peppermint
LI: Yes to Carrots
Stylers: Shea Moisture Curl Enhancing Smoothie, LA Looks Sports, Suave Professionals Captivating Curls Whipped Mousse