Kat,
Wheat protein will not be your friend. Soy I'd stay away from too. Keratin protein will probably be fine for you, as it is for me. I also do well with silk protein.

I have silk protein in my conditioner and keratin in a gel. I use only one protein product less than once a week and I'm fine.

Regards,
3A, Protein Senitive, Low Porosity,
Med-Course
Wash: Suave Naturals Conds (excluding Coconut), CVSB
Rinse out/Leave In: GVP Cond. Balm, KCKT,
Style: Naturelle Gel(winter HG), KCCC (summer HG), Flaxseed gel
SOTC: JCNS
Love your hair: Love yourself!