I also found the DE coconut quite moisturising/quite good slip. I'm not so protein sensitive but since the product is protein free it will be interesting to see if you liked it.
For co wash with slip I don't think the ones I use are available except in Uk (except maybe the Hairveda amala cream rinse) , but believe I read on here that Giovanni tea tree triple (or something like that)conditioner has slip.
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.