I have low porosity, coarse, super dry hair as well. Glycerin bothers my hair worse than silicones, which I don't have a problem with unless I layer them too many times without a cleanse in between. I never use SLS or ALS in cleansers, even for clarifying. If I need a really thorough scrub, I use Queen Helene Mint Julep shampoo.
Curl creams are always better than gels, for me.
ACV is horrible on my hair, and it seems to aggravate dryness and tangles for days after I've tried it. I find that I need products that add "weight" and smoothness, because my coarse hair "poofs" all the time. When it's not poofing, it likes to wind itself up in natural dreadlocks that feel like frayed rope. Protein as an ingredient in everyday type products rarely bothers my hair, as long as it's not high up on the ingredients lists, but I avoid protein in "deep treatments". Too much protein makes my hair feel like a waxy cotton ball.
If your hairspray contains sd-alcohol, you'll probably want to stop using it for awhile. I know for me, hairspray is incredibly drying and it tangles the heck out of my hair. KC Spiraling Spray works well for me when it's humid or high dew point temperatures, but when it's dry/low dews, forget it. Same with KCCC, but it doesn't dry-out my hair as much as KCSS. A "custard" that I love is 4Naturals Spring Back. It has amazing frizz control and it defines my hair more than another other product I've tried. Also, SheaMoisture Milk is very nice for a combo leave-in/styler.
The best thing for me has been "moisture moisture moisture". My hair can drink up shocking amounts of moisture and still want more.
3b, Coarse, Low Porosity, Desert ClimateFavorites: CK Knot Today, Mystic Divine Shampoo, Conditioner & Curl Cream, Miracle 7 Heavenly Healer Shampoo & Leave-in, Miss Jessie's Quick Curls, Ouidad Climate Control Gel