Hi plusforce,
Member feedback is always welcome and appreciated on the forum … even if it’s different from the norm 
I’m not sure if this is applicable to your situation or not but in some cases some types of mattress protectors (such as the thin waterproof membrane type) or some sheets or other bedding over the wool can reduce the ability of the wool to regulate temperature.
I don’t normally include futons in my research or forum lists but the same “rules” apply as mattresses which is that a futon is as good as the quality of the materials that it’s made of. Post #2 here has a list of a few futon options but of course it’s not complete.
Phoenix