Yes, I am a side sleeper. I have had bursitis in my one hip for many years (ski accident), and so I slept mostly on one side over the years; so I am really sensitive. So much that when I change sheets and they are tighter than the last time I feel that change on my hip, that is how finicky I am. I was surprised I could sleep on my bad side and didn't have pain with this current setup. Crossing my fingers that it will last.
I went with 2" thinking I would not use the 1 1/2" under it, but it turned out I liked the 3 1/2" of 24ILD. If I end up having back pain, I will remove the 1 1/2" layer.
Take into consideration what you are covering the mattress with, it will make it firmer depending on what you use, as well as your base for the foam. It really is a hard choice to make and unfortunately it is trial and error (boy is it). There are so many variables to consider.
When I bought medium foam at a local upholstery shop that was 2" I loved it. Then I went back and got 3" for a different chair, and I hated it, it was so firm I couldn't use it. I made sure it was the exact density too, so it really is tough to get it right the first time. Also shows you if you buy the exact density of foam at 2" and 3" they are not the same at all.
If you and your wife are finicky like me, maybe you need to try once piece of latex at a time and see what you think. Have you asked for samples of latex to give you an idea of what you think of it?
Good luck and keep us posted on how it all goes for you.