Thank you, Phoenix. 
If you happen to know this offhand it would be great as it could save me some time; if not, I will find out. Do you know of any manufacturers/retailers that use 7.1 pound memory foam besides Tempurpedic? I am trying to duplicate my Tempurpedic if possible or at least get close.
So far, the densest memory foam spec I have come across that is not Tempurpedic is the 5-pound Sensus memory foam.
If I am sleeping on 4 inches of memory foam that is between 7.1 pounds and 5.3 pounds I am not sure how 3 inches of 5-pound Sensus would feel in comparison. I hope that makes sense. It seems like it might feel different without having the 7.1 pound in the mix.
My current mattress (if the Tempurpedic Rhapsody Luxe specs haven’t changed):
Comfort Layers
2" TEMPUR-HD 7.1LB
2" TEMPUR Material 5.3LB
It seems that if I went to 3 inches of 5-pound Sensus that it may not feel the same.
Thank you.