Hi Lodavis7,
It seems you and I have similar issues when it comes to mattresses. I would like to share my experience with you in the event that you may find it helpful.
Like you, I am 5’3" and lightweight (105 lbs, hips 34", waist 24"). I have scoliosis so the perfect mattress seems like an elusive dream at times, though closer now that I have found this website. I tested a mattress in a local store (Los Angeles area) that is 6" 32 ILD with 1" 24 ILD on top and another with a 2" ILD on top. I felt quite [u]uncomfortable [/u ]on the 2" because I felt like I was just experiencing that layer without getting much support from the firmer layer underneath, I simply don’t weigh enough for 2" of a soft layer. The 1" was so much more comfortable because it was soft enough to conform to my curves but not so soft that I “hammocked”. I’m not solely a side sleeper, but also sleep on my back and stomach, which is why I haven’t decided between that mattress and one without the 24 ILD layer (just 6" of 32 lLD). All the mattresses I tried were latex blend: 70% natural 30% synthetic.
I know that you already purchased a mattress, but in case you were interested in something similar to what I tried out, www.mygreenmattress.com (which Phoenix suggested in one of his posts) has the option of getting a mattress with a 1" layer on top. I spoke with Tim, who was very nice. He carries 100% natural latex.
I wrote in more detail about my situation here Post #1
Good luck!!!