Hi jwevans01,
I would also think that this would be the most “logical” choice for both of you considering your weight and sleeping position. I would also do some local testing if I could to confirm how 3" of talalay in the 22-24 ILD range felt to you (it can be different from what people are used to in a more “mainstream” mattress. It may also be true that you prefer a 2" layer or a softer ILD but without some local testing this would be difficult to know for sure and I would stick with the recommendations of the manufacturer you are dealing with. It’s also worth noting that I personally would tend to ask questions on the phone rather than by email because phone calls can accomplish more in half an hour (including talking about options that may not be obvious on a manufacturer’s website) than weeks of emailing questions back and forth (and they can also address questions that you may not even think to ask or know needs answering in an email).
Post #3 here includes the factory direct manufacturers in or near Louisville which may be worth including in your research either as purchase options or to test different types of layering.
With a little bit of local research … any online choices can be made with much more confidence that they take into account your personal preferences that only you can feel.
You have some good options available 
Phoenix