Hi dawnbrews,
They would probably be the best source of guidance to help you choose a firmness level (see mattress firmness/comfort levels in post #2 here). Have you talked with them?
I would be very cautious about using other people’s preferences as a guideline about what may work best for you since a mattress that is “too firm” for one person can be “too soft” for the next.
If you are still uncertain after a more detailed conversation with Dreamfoam then it may also be worth considering their Eurotop which gives you the option to change the firmness level after a purchase if you need to.
Phoenix