I'm with etos on using a protein conditioner. For my leave-ins I just use my regular rinse out conditioners, most of which contain protein. I love using CJ Beauticurls Strengthening conditioner as a leave in, it's light and has a nice protein/moisture balance.
Loves protein and oils

Low-poo: MopTop gentle shampoo
Co-wash: CJDF, Jessicurl Aloeba
RO: Jessicurl Too Shea, MopTop daily conditioner, CJ rehab, CJ strengthening
LI: ^^^
DT: Jessicurl WDT, SS Deeply Decadent
PT: SS protein treatment, Ouidad 12 min
Oils: argan, sweet almond, jessicurl oil blend
Stylers: SS firm hold, SS curl enhancing jelly, Kiss My Face Upper Management gel, AG Recoil