Does the Deva foam have polyquats? Could it be buildup? I know several people have problems with polyquats, 4, 7 and 10 being the main offenders. I'm just throwing yet another thing out there.
2BC/f/II. fine - low/normal porosity - medium density - normal elasticity.

Currently using:
Cowash: Cure Care diluted with water 1:1
RO: Cure Care, V05 Kiwi Lime
Styler: UFD CM (old formula), FSG + CNPF
PT: IAgirl's gelatine

Experimenting with: CeraVe Foaming as low-poo, gelatin gel

light moisture, hydrolized protein, jelly stylers
guar hydroxypropyltrimonium chloride, sulfates
Neutral on cones.

iherb discount code: CFN646