It's been a long journey to figure out what works best to get rid of the pain in my lower back/hips and more recently my shoulder as well. I can say I finally figured it out and it's been a godsend to allow my body to start healing again. As I indicated in my last post the pocket coil layer just wasn't working for me after trying to make 2 different designs work. So I scrapped the entire idea and decided to look at other options. After experimenting with an air bed I was able to get some immediate pain relief so I decided to go that route for my latest build. I also figured that having an adjustable layer would help tremendously in making the solution work for both my wife and I (since we are very different sizes) and this turned out to be key for a few reasons. It certainly took a while to source all the parts since I'm in Canada and obviously Covid makes it harder to get them across the border. Anyway, here's my final design and I'm very happy with it.
The comfort portion of the mattress has 2 separate layers of Dunlop latex, a 2" layer of firm (ILD 44) that goes across the entire king bed and a 3" layer that is medium (ILD 30) on my side and soft (ILD 20) on my wife's side. I got them all from Sleep on Latex but I did have to go through a few combos to figure out those worked best for our needs.
The base layer is essentially a Sleep Number setup with a custom foam border. The Sleep Number materials (air chambers, air pump and remote) all had to be bought used because SN does not sell new parts to anyone unless you already own one of their beds. Also the new SN 360 beds don't have the hoses in the right place (since they now want you to buy their bases too) so you need to buy older parts to make this all work. If someone was doing this from scratch it might be easier to buy a used P5 (10" height) or P6 (11" height) to give you the parts you need to build the bed. The foam surround came from
www.airbedrepair.com
and I got both the surround as well as the foam that goes in between the two air chambers. The foam surrounds they offer are a much better design than what SN puts in their beds because it solves 2 important problems, lack of firmness and sides bowing. Their design is very firm and there's no issue with the sides bowing because they are connected with fabric. You will need to make a hole in the fabric for the hoses to pass down through the bottom of the mattress near the headboard on each side. I just used a cutting board (protects the box spring below) and a sharp knife to slice the fabric/cover for the hoses to pass.
This shows the foam surround and one of the air chambers
Here's the remote to control the pressure in each side
Now I sleep perfectly well all night and don't wake up with anymore pain in my joints (still a bit stiff as I'm still recovering from being in pain so long). One big thing I noticed was that the settings I used for the air mattress are different when I'm on my back versus on my side. Most of the night I sleep on my side but in the morning if I want to look at my phone I need to adjust the bed to be comfortable in that position. I hope this writeup helps others to get to a place where they don't experience pain anymore either.