Origins Comfort too Firm - Alternative?

Hi John and Ryan,
Last Summer we purchased a super king Origins Comfort mattress from you for our slatted wooded bed base. We found it to be far too firm but expected it to settle a bit but year on we still find it far too firm unfortunately. We are not sure why this is - we weigh 10 stones and 14 stones and we were advised before purchasing that we would most likely find it to be too soft!
We have been mattress hunting again and have today tested the Vi Spring Shetland which we both loved and found incredibly comfortable (if also incredibly expensive).
I notice that you see the Artisan Luxury mattress which seems to be your softest. Can you please let me know if this is at all comparable to the Shetland and if you think it would feel like a soft enough mattress for us as we seem to prefer a very soft bed. Is if softer than the Origins Comfort?
Thank you
Jules