Hi marshmallow,
Thanks for the update … I appreciate it.
If your layers are the same as the Savvy Rest you tried (same type of latex and the same firmness level) then for most people your mattress would feel very similar to an equivalent Savvy Rest so as they mentioned it’s probably just that your mattress needs to break in for a while longer although there are also some other reasons such as your mattress protector or any mattress pad or even the sheets and bedding you are using that can also change how a mattress feels (see post #2 here).
Human memory for softness, firmness, and “feel” is also very subjective and short term and fairly unreliable so it’s also possible that your mattress may be closer than what you “remember” the Savvy Rest felt like if you were to compare them side by side in “real time”.
In any case I’m looking forward to any additional updates you have the chance to share once you have spent a few weeks on your mattress 
Phoenix