I don't get it, why is my foam cushion sofa more comfortable than my new Latex mattress? Help!

I’m definitely an extreme case when it comes to finding the right mattress. But this go around pales in comparison to the shear hell I went through 10 years ago, when I didn’t have a clue where to start. I went through probably 4 or 5 inter spring mattresses, the SAM air mattress, a Supplepedic memory foam mattress, and then finally ended up with a latex mattress. This was over the corse of 6 months. At least I feel like I’m on the right track this time, thanks to this site and your help.

So I’ve been following your suggestions, making slow changes, and I’ve made some progress, although short lived.
First I noticed that my Temperpedic pillow was like a flat pancake in the morning, so I bought a new one. Same thing though, completely flattened by morning. When I first got my mattress I tried the shredded latex pillows that came with it, and thought they were the next best thing to the Temperpedic contour pillows I’ve been using for years, so I started rotating them in once in a while.
I am now using the shredded latex pillows exclusively. It seems they just needed a little breaking in, and getting used to, but now I absolutely love them. Because they don’t flatten out, they’ve helped a little with pressure points on my shoulder, while lying on my side. They also work fine sleeping on my back, because they can easily be adjusted by shifting the latex around. So a little progress with pressure points while lying on my side, but I’m still waking up at times with a sore and stiff back, and experiencing pressure points while lying on my back. I should mention though that my job is physically demanding at times, which may explain why I’ll sleep just fine some nights, and not others. This is all with the soft, med., firm, extra firm combo.

Last night was one of those nights I found myself tossing and turning, so at 1 in the morning I decided to try removing the wool mattress cover, and remaking the bed. I immediately felt a difference for the better. No pressure points while on my back, and less while on my side. I still however woke up with a sore stiff back, which suggests I go firmer, but that’s going to wrong direction for reliving the pressure points on my shoulder, while lying on my side. Is zoning my only option?

One more question. Is there any way to objectively determine if my back is properly alined while lying on the mattress? Perhaps having someone obverse the straightness of my spine, maybe even with the use of a laser? There has to be a way to take some of the guess work out of this whole process.