Hi,
Like lot of people here Iām trying to know more about these 2 brands : Casper and TN. I would be very happy to have more feedback on your experiment 
Thanks for this wonderful website which contains lot of information (for those interested in Capser, TN you should also have a look on this thread :https://forum.mattressunderground.com/t/tuft-needle-casper-leesa )
Thanks, Charles