sorry to hear your frustration!
I have a few thoughts as well.
1. Many people don't like Deva products for one reason or another. Plus, your hair just may not like certain proteins. For example, my hair really likes keratin but hates oat protein.
2. How are you applying your styling products? I scrunch in my products to soaking wet hair. I see you are manipulating your hair quite a bit after the shower (leave-in, styler, gel, bun) which could contribute to frizz. Also, are you scrunching, raking, etc?
3. Do you detangle in the shower?
Coarse texture, normal-high porosity, normal elasticity (Komaza Care), very weak waves
shampoo: Redken Fresh Curls
rinse out: Elucence, CJ Curl Rehab
leave-in: SM Milk, Oyin Hair Dew
jellies/creams: UFD's CM, CJ CCCC
gels: CJ CQ, BRHG, CJ PP