Hi HTM.
Apologies for not replying sooner!
Thank you for sharing your sleep stats and some of your history and preferences with us. t sounds like you’ve done some testing and research and have a good idea of what you like and need in terms of support.
To quote Phoenix…The thickness of a mattress is just a side effect of the design and by itself isn’t particularly meaningful because whether a thicker or thinner mattress would be better or worse for any particular person will depend on the specifics of the latex (type, firmness, layers, etc.), your preferred sleeping position and your own somatotype and mass. Thickness is only one of many specs that are used to make different mattresses that perform and feel differently and that makes a mattress suitable for one person and not another.
There is more about the effect of thickness in post #14 here. For a latex mattress, 8"-9" is usually more than enough for most sleepers and positions, depending upon ability to customize layers, but ranges of 6" to 12" are quite common.
Regardless of how thick or thin a mattress may be … the most important part of the “value” of a mattress is how suitable it is “as a whole” for your particular body type, sleeping positions, and preferences in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) regardless of how thick it may be.
I also went looking for specifications on these mattresses but yielded nothing. I did find some forum mentions of “gentle firm” latex referring to a Zenhaven model, and the ILD for that was 30 - 35. For reference, the firmest latex out there has an ILD of 50, where the softest is an ILD of 12.
A number of our Trusted Members sell all latex builds and any one of them would be able to help you find that “gentle firm” you’re looking for. Ken Hightower with Arizona Premium Mattress could be a great resource for you here.
I hope this helps you move in the right direction towards finding your perfect mattress!
NikkiTMU