Hi everyone, I am writing here to seek for an advice. Sorry by now for my english (I am italian) and the mistakes I could make and for the long post.
Also, in italy I cant come around most of the brands you have in the USA, aside tempur and latex bed are extremely rare here.
Back in July 2023 I started having pain in my left hip, pain that I had until mid january when I went to see an orthopedic that diagnosed me with a trochanter bursitis and healed me with a couple of cortisone injection. I also stopped doing pole sport and started to make pilates to help my leg. We also found out that I have a slightly dystrophic disk between my last lumbar vertebrae and the first sacral one which I figured since I suffer from hyperlordosis.
Eventually I got better but from time to time i still experienced this pain in my hip, so I decided to change our 13 years old very basic orthopedic mattress that I figured has sagged on my hip area and made me touch the slats (?).
So, a month and a half ago we bought a 20cm mattress that had 2cm of memory (way too thin) and the rest of water foam (aka polyhuretane).
I have a 10 yo ikea brimness bed with slats (the old version of lonset with no differentiated zones).
The mattress was ok for my lower back. I felt that the firmness was quite right (maybe excessive) but it kept my vertebras stretched out.
On the other hand, since I am a side sleeper (that eventually rolls on her back during the night) the mattress was too firm on my shoulder, resulting in cervical inflammation.
After two week of use of this mattress I had my left shoulder blade inflamed and also tension in my neck.
I also tried with a 6cm memory foam topper but, although my shoulder improved, my lower back started to hake because my bottom sank too much.
We then tried for other two weeks a hybrid mattress, with 800 coils and 6 cm of memory foam (50kg/m2 density) with some other thinner foam layer before the coils.
This one was too soft for me, resulting in lower back pain (which I didn’t have before - I only had sciatica and trochanter bursitis in my left leg) and I had to go sleep on our old beddinge couch (ikea) to heal my back again.
Now we have switched to an all natural latex ikea mattress. Mausund.
I really like this one. My cervical pain has gone for good. But my lower back isn’t ok quite yet.
In the morning, although I have no pain at all during the night, I get up and feel my lumbar area stiff.
I don’t have pressure points. I tried a memory topper for 5 minutes and the pain got worse! While after stretching on the floor and using two tennis ball to decompress my lumbar area I felt better.
So my guess is that the mattress is ok for me, but I need to make it a little bit firmer in my lower back area.
I was thinking of changing the slats to ikea lumber flat slats (lindbaden) (which are also the one that are used in the ikea show room) or eventually take the ones that can be regulated on the lower back area (i am a little bit scared that the flat ones can be too hard on my shoulder again and inflame the shoulder blades when I sleep on my side).
But before doing this (since it has been almost two months of trials) I wanted to ask you what do you think of my situation and if I am doing the right guess by making the bed foundation firmer in order to get rid of this pain.
I would like to keep this mattress because it feels the best one I tried so far. It is a medium firm, not too firm but also not soft. I also have been feeling like the princess on the pea and I really don’t like it 
