IIRC, mushy hair usually means that you need more protein.

GPB is a fairly protein heavy regular conditioner. I don't know if I'd call it a protein treatment per se. It was too much for me.

If your hair is still mushy after protein, you might need a stronger treatment like the Aphogee one.

A more protein tolerant person can answer you more properly. I just watned to chime in about the mushy part.
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Med/Coarse, porous curly.