I want a mattress as natural as possible (without springs) so I am interested in a latex bed. I weigh 72kgs and I'm a side-sleeper. (I have ME and sleep isn't easy.) For comfort, e.g. hips and shoulders, I guess a deeper topper would probably be good - Fusion 1. However, I want to avoid over-heating which would probably indicate a shallower topper - Fusion 3. So I have competing requirements. Any suggestions, please?