Origins Pocket Latex 1500 too firm for me, but not for husband.

Hello, we purchased the Origins 1500. I'm 172 cm tall and weigh around 60 kg/131 pounds and my husband is 186 cm tall and weighs 83 kg/185 pounds. Trying a few mattresses in stores, I had always preferred firmer mattresses than my husband, which is why we thought the Origins 1500 could work. However, having slept on it, I'm finding it too firm, waking up with sore hips, back, and shoulders. My husband doesn't experience any of these problems. We really like that the mattress isn't "wobbly" at all though, so we're not disturbed by the other's turning and tossing, and we fear a softer mattress might have that effect. We're not sure what to do - do you have any advice? Could a memory foam topper help or should we consider returning the mattress and getting a softer one? Many thanks!