Hi boroczk,
It sounds like you chose a mattress that wasn’t suitable for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) and if I was in your shoes I would probably start all over again and go for a refund because there are many memory foam options available that use the same or better quality materials as Tempurpedic that are in significantly lower price ranges.
I would also “reset” how you shop for a mattress and the tutorial post here has all the basic information, steps, and guidelines in one place that can help you make the best possible choices … and know how to avoid the worst ones.
Most mattresses that use foam (polyfoam, memory foam, or latex foam) or pocket coils will work well with an adjustable base as long as they aren’t too thick. Most mattresses that use innersprings that have coils attached to each other with helical wires or that have a border wire that can’t bend (with some exceptions) aren’t usually suitable for an adjustable bed. Each manufacturer or retailer will be able to tell you which of their specific mattresses are designed to work well with any adjustable bed
The better options and possibilities I’m aware of in the Austin area are listed in post #2 here.
Phoenix