Boy, can I relate to your post almost word for word.
I'll be watching this thread.
I can share that I've found a shampoo bar brand that is sooooooo slippery that I can detangle with it. They make several different formulations. So far I've trialed two from the sampler I purchased. One left my hair moisturized. One left my hair SQUEAKY, SQUEAKY clean. I have a review here:
https://myhairgrowthstudyexperience...f-j-r-liggetts-coconut-argan-oil-shampoo-bar/
Basically, the moisture formulation is my holy grail cleanser. I chelate once a month and use a scalp cleanser. Otherwise, no other cleanser for me.
About DCs, I've tried dozens to the point of fatigue over it. I found one with amazing slip: the Mielle Organics Babassu Oil & Mint DC one I got from Sally's. Then . . . I found the only one that gives MY hair lasting moisture: the Camille Rose Naturals Coconut Water Deep Penetrating Hair Treatment.
I wish the former gave me a feeling of lasting moisture. I wish the latter had amazing slip. Then I would only purchase/use one. However, given that I can detangle with my shampoo bar or Soultanicals Slip-N-Slide Hair Glide, if forced to choose just one, I'd have to go with the CRN Deep Treatment.
Last: Qhemet's Cocoa Tree Detangling Ghee detangled both my dry and wet hair like a boss and is advertised to be able to double as a deep conditioner. I purchased a sample because it's expensive, IMO.
Please let us know what ends up working for you!