I am looking for some advice reconfiguring my latex mattress.  I am a big male 6' 4" and 320lbs.   I have been waking up with lower back pain after 4-5 hrs sleep.  My situation is unique, our baby is in the bed preventing me from rolling over. (let's not have a debate about co-sleeping, please)

I have a Flobeds mattress with 3 2.8" latex layers plus their convoluted top.  Config was:

Top convoluted, then soft 20ILD, then xtra firm 36ILD, with superfirm 44ILD on the bottom.

I just swapped the bottom two layers, and flipped one upside down, so we have at the moment,

Top convoluted, then soft 20ILD, then superfirm 44ILD, then xtra firm 36ILD upside-down on the bottom.

I know if I make things too firm, I will have pain in my shoulder.  Actually I get a little bit of that now but  not bad compared to lower back.  We'll see what happens with this setup.

I'm thinking about getting rid of the soft layer and using memory foam there instead, or replacing it with medium/firm 30ILD.  Another option woulld be to put rigid foam (ILD70) on the bottom raising the firmer layers taking out the soft.  Also thought about a combination of this with 2 or 3 1.5" or 1" layers.

I could use some advice.  Thanks.