I would focus more on using some protein rather than lots of shampooing. Joico K pak could be a good start, or Tigi - I am not sure if they are all totally CG but I wouldn't worry about that too much right now. If you can get A'kin they have lots of stuff with protein in, there are probably more options with protein than you think once you look around but if not Joico and Tigi should be fine. I am not sure how long it will take to see a difference if protein is the issue and you start using it, but you can keep an eye on it and hopefully you'll reach a balance point where you can just maintain, using a mixture of moisture and protein products. If protein helps then you're obviously someone that does need some, but how often you'll have to find out by trial and error I guess when your hair is back on track. Don't worry, I think a few protein treatments will probably sort you out.
UK based wavy

Mostly waves, but curls and straight bits too!
Fine to medium, high porosity, medium density, very low elasticity
Highlights damage (growing it out), seems to like protein and need lots of moisture.

Cleanse - CJDF, trying out low poos ; Co wash- Uk chemist brands, Urtekram Rose or Aloe, Hairveda Amala Cream Rinse; RO - varies, Tigi Moisture Maniac, Desert Essence Coconut ; Leave in - Keracare natural textures; Sealant - argan oil
Trying out new things, still looking.