Thanks so much for taking the time to ask a question and provide so much information.
Hopefully, I will be able to point you in the right direction for you both.
Looking at the models you mention it seems you are basing your selections on medium models. If you are doing this based on the feel of your current mattress then that is the completely wrong way of doing it. Your bodyweight at 11st would require a medium spring tension to give you the correct amount of support. Your back pain could be exacerbated by your current mattress, incorrect spring tension can cause back pain as can a mattress that has settled or is simply too firm in the upper layers.
|Upto 8 Stone / 50kg||Soft
|8-16 Stone / 50-101kg||Medium
|16 Stone / 101kg Upwards||Firm
The advice used to be if you had any type of back problems you should get a firmer mattress but that is no longer the case. You need the correct spring tension for your body weight and the upholstery is then based on your personal preferences and sleeping habits.
Our Origins Pocket 1500 knocks socks off all the models you mentioned and the Origins Pocket Latex 1500 will be perfect for you if you prefer the firmer feel. If you are looking into the Artisan Range. I would advise taking a look at the Artisan Naturals in a medium spring tension. This would allow you to still feel on top of the mattress at the same time as allowing you to both sinks adequately into the upper layers of the mattress in order to avoid any potential pressure point pains.
Please take a look at this article for some further advice on the best mattress for people with bad backs
I hope this helps, if you have any further questions please don’t hesitate to contact the office on 0161 437 4419