I may be wrong but is the Giovanni shampoo you're using a lo poo? I would suggest clarifying with a sulfate shampoo if it is. It may just be buildup only sulfates can remove. Use a DT afterwards if it feels dry.
2b//high porosity//fine texture//medium density//low elasticity//loves protein
Lo-poo: SMMR, SMC&S
Clarifying: VO5 shampoos
Co-wash: VO5 conditioners
RO: VO5 conditioners
Styling: AIF, FSG, gelatin gel, ecostyler krystal
PT: IAGirl's gelatin treatment