Hi rcseisland,
Just as a general comment … when you are posting on a forum then using all capitals is considered to be the equivalent of “shouting” when you are using your voice and it’s easier to read if you don’t use all capitals.
I’m sorry to hear that your mattress didn’t turn out to be the best match for you and that you are sleeping too hot but there may be several things you can do to resolve your issues without having to purchase a whole new mattress.
I would also make sure that you’ve read the mattress shopping tutorial here which has all the basic information, steps, and guidelines that you will need to make the best possible choice.
The first issue you are having is sleeping temperature and there is some information in post #2 here and the post it links to that may help you track down the most likely reasons why or if there is anything you can do that may be helpful. In many cases … changing your mattress protector or the type of sheets you use can make a significant difference in sleeping temperature.
The question of the firmness of your mattress is a little more difficult because the best option would depend on whether your mattress is too soft or too firm for you. Based on your comments I would guess that it may be too firm and some of the suggestions in post #2 here may be helpful but only you can really know this based on your sleeping experience.
The specs of the Nature are listed here and as you can see the top two layers are 2" of 21 ILD Talalay and then 2" of 28 ILD Talalay which are a little softer than the 3" of 28 ILD Talalay that is in your mattress (along with the softer polyfoam quilting layer). If the Nature is a good match for you in terms of PPP then it may be worth considering a latex topper that can add some additional softness and pressure relief to your mattress. Post #2 here and the topper guidelines it links to has more about choosing a topper that may be helpful.
If your mattress is too soft then a topper wouldn’t be nearly as helpful because adding a topper isn’t a particularly effective way to firm up a mattress that is too soft (see post #4 here).
If you spend 15 or 20 minutes carefully testing a mattress in a store using the testing guidelines in the tutorial post then the odds are high that most people would make a choice that was in the range that was suitable for them and was “close enough” to their ideal that only minor fine tuning would be necessary (see post #4 here).
Having said that … if you are not confident that your testing will be “close enough” to your actual sleeping experience then the return or exchange policies that are available to you after a purchase would also become a much more important part of the “value” of a mattress purchase and your own personal value equation and of course I would trust your “best judgement” about the importance of a return and/or exchange policy.
Both of these use high quality materials and neither one has any weak links in their design in terms of durability but once again … your own testing or experience will be the most reliable way to know whether either one is a good match for you in terms of PPP and if you aren’t confident about this then I would pay significant attention to the options you have available after a purchase. There is also more about the differences between the “feel” of Talalay and Dunlop in post #7 here but this would be a preference choice much more than a “better/worse” choice. There is also more about the most important parts of the “value” of a mattress purchase in post #13 here that can also help you make more meaningful comparisons between mattresses.
There is more about buying a mattress from big box stores like Costco or Sams Club in post #4 here. While they generally aren’t the best quality/value choices for most people and they are not particularly good at providing good guidance about their mattresses … they do have a good return policy so if you roll the dice with one of their mattresses and it doesn’t work out for you then at least you have the benefit of being able to return it and starting all over again. There is also more about the American Dream Organic (which is the Innomax White Night) in post #2 here and post #4 here and it would be one of the better quality/value options at Sams Club.
Having said that … the tutorial post also includes a link to a list of the members here that make or sell latex mattresses that include different types of latex (including Dunlop), and have a wide range of different designs, features, options, and price ranges. Many of these are component mattresses that allow you to rearrange or exchange layers to change the comfort/pressure relief or support/alignment of the mattress after a purchase without having to return it and some of them also have a great return policy as well if the “worst case” happens and none of the options that are available turn out to be suitable for you. For most people these would be in a better value range than an “all or nothing” choice such as the American Dream latex mattress but of course once you are down to finalists that are all between “good and good” and there are no clear winners between them then the final choice that is best for you will depend on “best judgement” and on all the objective, subjective, and intangible criteria that are most important to you.
Phoenix