Hi firtree,
My guess is that because of your lighter weight and the firmness of the latex that it’s your shoulders that aren’t sinking in enough rather than your pelvis that is sinking in too much. Are you having actual symptoms of pain or discomfort (such as lower back pain) or is it more just a “feeling” of being slanted that you don’t like.
If you are a side sleeper then someone of your lighter weight may do better with softer latex to “allow” your shoulders to sink in more until the torso comes into firmer contact with the mattress and then both the shoulders and pelvis would be “stopped” at the level of the firmer support layers. The firmer latex may be “holding up” your shoulders too much.
It may also be worth considering a shredded latex topper which will displace to some degree and can allow your more “pointy” shoulders to sink in more than the pelvis (which has more surface area) and may improve ventilation as well. You can see some sources for these in post #4 here. The benefits of this may be lost however with a thicker wool topper over it.
The Flobeds shredded latex topper has a zipper that can be opened to add or remove latex in the different sections to make them softer or firmer under different areas of your body.
Custom Sleep Design also makes a zoned latex topper where the part under the upper body is made softer than the part under the pelvis (and they can customize this to your body measurements).
This could very well be true and even though latex is more breathable than other types of foam … it may be warmer than what you are used to sleeping on a mattress that had no foam at all. It would be unusual though that a wool topper on top of the latex would have heat issues for most people (unless perhaps the wool was very matted or compressed over time).
Just for the sake of my own clarity as well … are you just sleeping on three toppers laid on top of each other (with no mattress cover) and with your wool topper, mattress protector (if any?) and your sheets on top of this?
What is the thickness of your toppers?
What are you using under the toppers to support your sleeping system?
Phoenix