I use AOGPB for deep conditioning, so that's the light protein I use. As for strong protein treatments? I found that my hair does not react well to them.
What I use instead are restructurers (i'm under the impression that they're different from protein, if I'm wrong, sorry lol). To that end, I use: Joico K-Pak restructurer (works the best on my hair)
I used to Nexxus Emergencee, but I don't use it anymore. It worked well enough. I just like my hair's reaction to Joico better. HTH!
ETA: my hair HATED aphogee. Never again!