Hi pmperron.
I am so sorry for not getting to your questions sooner! As a rule, we never make a specific mattress recommendation to anyone from any brand (Trusted Member or otherwise) as purchasing a mattress is such a personal experience that requires careful testing, and conversations with the retailer or manufacturer themselves with regards to your body type, sleeping position(s), general preferences and history, some general information about mattresses you have tested and done well with, and any other specific information or circumstances that could affect your choice of a mattress.
We will occasionally recommend that a consumer check out a particular Trusted Member if we feel that consumer may benefit from a conversation with them and/or a product they offer; all of our Trusted Members are extremely knowledgeable and compete with the best in the industry. We think very highly of them as they were strenuously vetted and have to comply with a number of high quality and transparency standards to be Trusted Members on The Mattress Underground.
But beyond that, we always recommend that any consumer educate themselves as best as possible with the resources we make available to them, and then choose the mattress they feel is their best fit based on personal testing and the
Mattress Durability Guidelines
.
We also recommend that anyone just starting their search (or even in the middle of their search) review our
Mattress Shopping Tutorial
as well as these
five steps to finding your perfect mattress.
Now that that is out of the way

I am sorry to hear you are sleeping hot on your current mattress, and that you are finding it to be too firm.
As a back sleeper, the "gaps" in your profile are not quite as deep as in side sleeping, a slightly thinner top layer will generally work a little better. In back sleeping, a slightly shallower cradle is needed. A good starting point for a back sleeper is 2" of softer material on top of your mattress and then increasing or decreasing from there depending on other factors like weight, preferences, or other sleeping positions.
You can read more about the comfort needs of the varying sleeping positions
here
.
I wouldn't call the configuration you suggested "overkill" but you may actually benefit from thinner comfort layers, and it's just luck that they are easier to find and more affordable. And, speaking very generally, it's usually far easier to remedy a "too firm" mattress than it is to try and "firm up" a mattress that is too soft.
It is great that you have identified manufacturers you trust. I wish I was familiar with all of the ones you listed so I could give you an in-depth commentary, but unfortunately I'm not familiar with them. I can offer you this resource though, in case you've yet to review it, on identifying a [URL=https://www.themattressunderground.com/our-articles/finding-a-great-mattress-outletgreat mattress outlet[/URL].
I would - as previously mentioned - recommend speaking with the retailer you plan to visit about the options you are considering and offer them all the same information you offered here and see what kind of recommendations they make. If you feel they're putting their bottom line above your health and comfort, consider it a red flag.
I hope this helps you moving forward. I am happy to answer any other questions you may have, or ping Phoenix or Sensei for you.
@mattrebuild, thanks for your kind words and @mark5280, if you're still facing technical errors in your attempt to post, we'd be happy to troubleshoot those with you. Occasionally we find people posting from mobile devices face issues that others do not.
NikkiTMU