I have an old Dunlopillo medium single matress over 20 years old on a sprung edge base is in need of replacement soon I have a health problem that keeps me awake and need a matress that does not dig in yet is not too soft - the dunlopillo matress without the sprung edge base is far too hard however is perfect in combination. Tried a new Dunlopillo replacement v thick heavy thing unlike my old one and was not nearly as good / too much give with the base too hard without it. What system would you recommend that might suit me do not like memory foam.