I second the CJ Beauticurls leave-in - I love this one. My hair is normal porosity (not low, like yours), so I'm not sure how much difference that will make for you, but I also have fine hair that can also get weighed down. The KCKT didn't weigh my hair down, but it also didn't provide enough moisture (I live in a dry climate). The other leave in I really like is the As I Am leave in (available at Sally's); it's light weight but still moisturizing. I also love Curly Kinks satin roots - I haven't used it as much in the winter because I have to stay away from glycerin, but its a great leave in - not heavy, just the right amount of moisture, good slip.
2c/3a, botticelli/wavy/'swavy (huh?)
fine, dense, normal porosity/elasticity, dry climate
My favorite brands are Curl Junkie, Darcy's Botanicals, As I Am, Curly Kinks and Shea Moisture. Also love sealing with oil and styling with jelly products.
CG since 12/29/2011