I have been sleeping on Dunlopillow latex for 20 years, so when ever I go away the mattress is too hard except in France?! their mattresses are superb or Ibis Hotels. I have arthritis and have had back surgery and have nerve damage which causes leg pain. I need a soft but supportive mattress. For the last 2 years my mattress has felt too soft and is starting to dip. Its on a sprung divan base and I wondered if changing to a firm base might be the answer or trying a different type like a memory foam or mix of foams. I'm so confused, please help.