Hi desperate,
In case you haven’t read it yet … the first place I would start with any mattress search is post #1 here which has the basic information, steps, and guidelines that can help you make the best choices along with links to some of the forum posts you may find most helpful.
Post #2 here has more about how to make the most suitable design choices and links to some of the theory involved but these are just generic suggestions and are not specific to any person. I focus much more on helping with “how” to choose rather than “what” to choose and there are no specific mattresses I would recommend because there are too many individual preferences, variables, and unknowns to make any kind of specific suggestions based on specs alone out of the many thousands of mattresses that are available. To me a mattress is just a combination of layers, materials, and components that together are more or less suitable for the needs and preferences of each person. I would generally tend to avoid mainstream mattresses though and work with smaller manufacturers or sleep shops that have the knowledge and experience to help you make the most suitable suitable choices and tend to have much higher quality and better value than most mainstream manufacturers or stores.
In cases like yours … outside of working with experts … zoning may also be a worthwhile approach to consider because of your lighter weight and your pronounced lumbar curve. Post #11 here may help with understanding how zoning works although there may also be some non zoned designs that also work well so I wouldn’t “lock in” to a zoned design and would use your personal testing more than any “theory” as being the most important factor in your choice.
Some links to some of the forum lists that include the better options and possibilities in the general Massachusetts area I’m aware of and some links to feedback about some of them as well are in post #2 here.
In more complex situations like yours … who you deal with and their level of knowledge and expertise can be one of the most important parts of a successful mattress purchase.
Phoenix