Ok, I got it. . .maybe.
Try this. Use a clarifying shampoo, specifically to strip any product buildup off your hair. I say this because I know on my DD hair, if she has product buildup, then when I wash, the water doesn't penetrate very well, and the conditioner doesn't either, so I basically strip it clean and start from scratch periodically.
DC with ORS replenish(you may need two packs, or even to just buy a bottle, because you;ll need a lot)
After you apply the DC, also use an oil of your choice, but not a mix. just pick one whether it be coconut, olive, mango, etc. and thoroughly and heavily grease your entire scalp and seal your ends and then baggy your hair with the DC and oil on it.
You can sit under the dryer for 45 minutes or sleep on it, leave it on all day, whatever you choose, but leave it on for as long as you can.
When you are ready to rinse, use cool water and rinse it completely out and add in a regular conditioner AND a leave in conditioner of your choice. Make sure its enough to coat every single strand on your hair. now, if you DC'd overnight then go ahead and seal your ends and twist it or braid it, bun it or whatever you do. If you DC'd under the dryer then baggy overnight and the next day seal the ends and style it.
Do this and get back with us to let us know how it turns out. then let us know how your hair feels after a couple of days.