Hi MrSanRamon,
I’m sorry to hear about the foam layers in your Aurora mattress, and the product still being too firm for your liking.
The better sources I’m aware of for memory foam toppers (and a link for memory foam layers is contained there as well), are listed in post #4 here. Some of those companies offer 5 lb memory foam.
I hope you find something that works well for you and offers you better comfort.
Phoenix