Shampooing twice per week may be toooo much. Have you tried sheamoisture. Fine hair could enjoy the protein in the coconut hibiscus line and coarse hair (I know you said thick which often indicates density, but this may indicate coarse texture) may enjoy the raw shea line...just a thought These can be used as rinse outs, leave ins or moisturizers before sealing with an oil....
3B, Fine, Normal P, Normal E, Low-Med D
LowP: Kinky Curly Come Clean (50% EVOO)
NoP: As I Am CC
RO: Suave Coconut, VO5 Shea Cashmere
LI: KCKT or CJBCLI or HETT/HENOYF (w/ 8 drops GSO)

"To much is given, much is expected"