Hi Kim68,
Welcome to the Mattress Forum! :).
Thank you so much for your questions, and well done with all the research and contacting the companies and asking questions. Of course, as you have probably read on here, only you and your husband will be the only ones to be able to decide what is best for you both. It is really a combination of all the factors in terms of suitability (how well you will sleep), durability (how long you will sleep well), and the overall value of a mattress compared to your other finalists based on all the parts of your personal value equation that are most important to you (including the price of course and the options you have available after a purchase if your choice doesn’t turn out as well as you hope).
All of the mattresses listed are of high quality and high-quality materials. Regarding an all talalay mattress, I think it is a very good alternative and no reason why you should not consider it. It is very common for many manufacturers to offer Dunlop Latex as the “core” and Talalay latex as comfort layers. I say this in very general terms as many people have been very happy on “all talalay” latex mattresses…usually cost is the major reason people buy and many companies “offer” Dunlop and Talalay mixed.
Regarding the Talalay mix of 12 inches of latex, I would use Xfirm for both bottom layers, still no problem using top two layers of Firm/Med or Med/Soft for “softer” side.
The other two recommendations are solid, the only thing I would caution, is that for higher BMI customers, you may be receiving “firmer” recommendations, but you know that you like something a bit softer.
You have a good group of solid choices from three of our trusted members, so you are on the right track. Please let us know if you have any other questions.
Thanks again for posting with us.
Sensei