Hi Jacsl,
SleepEZ has a great deal of experience and tends to make good suggestions that would suit their customers in the long term and so unless you are completely confident that your testing is a good prediction of your actual long term sleeping experience I would tend to follow their suggestions. The worst case is that you would need to exchange a layer.
I don’t have any specific recommendations because it will depend on which of the tradeoffs that are involved in choosing between different types of mattress protectors are most important to you but post #89 here has more information and suggestions that should help you choose which one would be best for you.
Phoenix