Not the one for me

I was super excited about this mattress after reading all the reviews online, but when I finally got to spend a few nights with it I realized that it wasn't the one for me. It's far too stiff causing back pain when I wake up in the morning. I'm 165lbs male and I recently started sharing a bed with a partner who feels the same. I had to buy a 3inch memory foam topper to make sleeping bearable. I only had it for a year but I am ready to try a different mattress.