Hi MWOOD,
Thanks for your feedback and insights … I appreciate it.
As you know … no matter what any “standard suggestions” may be … each person is unique in what works best for them in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences). It’s great that you made the choice that is best for you. As you mentioned I also share your general caution about the “risk” of thicker layers of memory foam for some people.
The foundation post here has many good foundation options that are suitable for any mattress that is purchased online and there are often foundations that are available at local stores that work well as well so for most people this wouldn’t be a significant issue although it does take an extra layer of research.
Most of all though … congratulations on your new mattress 
Phoenix