Hi ddeg10,
As you already mentioned and I think you may have read about, there will be an adjustment period for any new mattress or sleeping system as the mattress loses some of its “false firmness” and the cover stretches and loosens a little and your body gets used to a sleeping surface that is different from what it is used to (see post #3 here). This would typically be a few weeks but it can be shorter or longer depending on the specifics of the person and the mattress.
One week worth of use isn’t enough for any new mattress to “break-in”, nor is it enough time to allow your body to adjust to a new product. With mattresses using firmer high-density polyfoam cores like the BME, there seems to be quite a bit of feedback in the two-three week range where people start to adjust to the mattress and the mattress also begins to soften just a bit. I would hope that you could give yourself some more time to adjust to the mattress. It will certainly be a more supportive feel than the old memory foam product you were used to, and I would have a concern with you getting something too soft for stomach sleeping for your wife.
One other thing also to evaluate would be your pillow, as with any new mattress you will sink in at a different level than as you did on your previous mattress, and it may be that you need to adjust that as well.
Hopefully you can sleep upon the new product for a few weeks more at least before potentially contacting Brooklyn Bedding with any thoughts of manipulating the comfort, and if it does come down to that you can bounce your thoughts off of them regarding not wanting a topper versus their “plush” version.
Wishing you good luck!
Phoenix