Thanks. My hair is very protein sensitive as well. I remember I started using grapeseed oil because I heard it was strengthening and protective. Now I don't know if grapeseed oil contains protein, but my hair HATED it. It turned into a rough, tangly, waxy-feeling mess. The only oil my hair likes that has protein in it is Avocado oil (thankfully). So now I've been making a mixture of coconut oil (which my hair adores) and avocado oil to preserve my hair's softness and strength. I'm so going to try the yogurt treatment thing. I believe I tried it once before, but I didn't like it because I mixed it with egg yolks, which is probably way too much protein, and my hair doesn't care for egg yolks too much.
I think I will take a page out of your book and add mild proteins to my DC as well.