Sounds like we have similar hair - although mine is very
fine. I did a post on my blog about my hair routine which might be helpful to you. (The link is below...highlighted in pink.)
It's been challenging to figure out what my low porosity hair likes. I have been on a mission this past week to research low porosity hair and figure out how to deal with it. My curls were looking a little limp (you can see a picture in my blog...they're S shaped vs my ringlets which I love.).
What I've found is that my hair NEEDS shampoo with sulfates. My hair never did well following the curly girl method. My hair got weighed down and overconditioned no matter what I did. Apparently there is a reason for this - some low porosity hair needs shampoo because it helps to open up the cuticle. I use Curly Haired Solutions - Treatment Shampoo. I never get split ends anymore, my hair doesn't break or get dry...I LOVE it. It's amazing stuff.
I've also found that my hair doesn't like oils. Anything with oils in it tends to weigh my hair down. I have had some luck with olive oil if it's low on the ingredient list...but still I have to be careful and stagger it's usage. Coconut oil is a no go for me - anything with this in results in limp hair.
My hair seems to like proteins - silk proteins specifically. Almost all my favorite styling products have silk protein in them. I find that this helps boost my curls big time. Oddly my hair seems to do well with mineral oil too which I don't get.
Gel is a must for me. I'd check the ingredients and find something with humectants and emollients. My hair seems able to tolerate these all year round.
Fine hair seems to need a harder holding gel to hold our curls in place. I recently found a gel by Biosilk - rock had gelee, which my hair is responding well to. My hair loves Curl Keeper (by Curly Hair Solutions)...liberally applied, but I usually have to scrunch a harder holding gel in at the end to keep my fluffy curls together. I'm going to try just using the Rock Hard Gelee next to see if it's better all on it's own than curl keeper - I want to try to get second day hair!
Anyway...I hope this helps! Feel free to write me if you need more help.