Doesn't sound like you need a trim to me.
How much protein is everyone using and how often?
Check your moisturizers for protein, you'd be surprised at what has protein in it.
Are you sealing?
I swear that getting rid of the protein for a while helps. Maybe you need to clarify and then use your moisture. You might have to much product build up. Or maybe you have hard water, this causes breakage. Mine is doing so much better. I am not using any protein. I thought using it would make it strong but it was killing my hair. I won't be using any kind of protein for about 3 weeks probably. I am not perming right now so I don't need a lot.