You and I are alike. I found the exact same to be true. I slept on a mattress with a quilted top layer which does effectively spread the weight over the coils more effectively, and that was murder on my shoulders. Ive since removed that and it sleeps much better.
If you are experiencing lower back pain , then its possible your hips are sinking further than your upper body. One way to tell is to have a mirror with a smaller mirror to check what your backs alignment is. Or to just have someone else check it for you.
Have you tried it w/o the cover AND w/o the 2" topper? And issue w/ 2" on 2" of that soft latex material, especially with wide shoulder, is that your hips have the potential to sink in further than your upper body.
A 10" might work, but if the tension becomes the same, it might just do the exact same thing. Youād sink into the topper further, and the material would tighten to the point where youād get pressure again. Though it might be worth a shot if you can return the thing afterwards.
What i find is that zoning works best for me. Though my current config isnāt perfect, cuz im out of project money, i need firmer support in the middle and softer under my shoulders. Its a royal pain to get right, but worth it for better sleep. If the SleepEZ offers zoning as a config, maybe thatās worth a try.
As far as latex is concerned. It is very supportive and resiliant. As a result it has a chance, on a uniformly firm surface, to bother people who have wide shoulders or uneven bodies. I definitely see that its a trade off. Too much hip support and my shoulders get pressed on. Not enough, and the hips hurt more or my spine goes out of alignment. Its certainly possible to get right, but a lot of it will come down, in the end, to you and how much money you have to put into it. Latex is nice, but you might need some kind of foam. I dont know. Youd have to experiment w/ other mattresses. Have you laid on any in stores yet?
There are lots of mattresses in a box that might offer zoning to varying degrees. Have you checked out OSO? Thatās a zoned configuration. Not sure the return policy. But there are lots of those types of mattresses you can possibly try. And lots of them are 100% free returns. NO shipping cost incurred so the trials are entirely risk free from your perspective (i could be wrong about some of them however).
Phoenix has a really nice thread about this somewhere and ill try to find it for you. He basically goes over a lot of them and describes the material and viability as a mattress.