I tried the Aerus last night with 1" of 19 ILD latex above it. I moved the 1" of 24 to the bottom of the stack, so from top to bottom I had 1" 19 ILD latex, 2.5" 5lb Aerus, 2" 32 latex, 1" 24 latex. Wool topper and mattress pad over everything.
I would say that definitely felt a bit more supportive for several hours. After everything warmed up, I could still feel a fair amount of sinking in. I could make a little firmer still by taking out the 1" of 24 on the bottom. I did not notice any back pain in the morning, so it seems like an okay solution.
However, at this point I feel like I am trying to work around a flaw and will probably return the Aerus. At 2.5" if is too thick for the support it gives me. It might work for someone lighter or if it was 2" or less. I think I can fine tune a more supportive and similiar comfort situation with the 1" Sensus and 1" of mem-cool that I already have.
I am coming to the conclusion that they give up something in the support area when they try to make it more open and breathable. It seems like a fairly tough technology to solve, which is perhaps why Tempur-pedic can charge a premium for a the research they have put into it.