Back Pain Nightmare

This mattress was heaven on earth when we purchased it new. Our love affair lasted only about 3 years when we began to notice "wheel ruts" where we slept in our king size bed. We spun the mattress to alleviate the positioning issues but to no avail. Now we are in our 5th going on 6th year of owning this mattress and need frequent chiropractic adjustments for low back and neck pain. Our original investment was under $1200, thankfully the store was closing and allowing deep discounts, although we expected more than 5 or 6 years of service for that cost. I was thinking of trying a latex topper to increase firmness and support but after reading reviews by other long term users it may be throwing "good money after bad"! It WAS a great mattress too bad it didn't last!