I think it’s time to report the good news!  The 3rd slab of medium latex has done the trick for my achy body.  I, of course, put the firm on the bottom in the new ticking, and then both the medium (in the middle) and the soft latex, topped with wool batting (on the top) in the first 7” ticking I purchased.  I am so happy to report that I am now finally very comfortable. Thank you for all your patience and help!!! – K. L.