Hi alasearwax,
Sorry the latex is not working out. Here are some posts/threads with people discussing the S&S mattresses.
Here is the thread for this topic link here.
In November they had some spec changes, as you will note in this thread.
Phoenix also discusses the 12" hybrid and durability and higher BMI needs in this thread.
Thank you again for your iquiry, let us know if you have any other questions. Good luck!!
Sensei