Hi Pierce,
I don't think one needs to get too sophisticated about the style of Cushion,my objective is to get that pelvic tilt that exposes her Klit,I find the cheap cushions quite adequate....But you make an excellent point about soft mattresses...Like all hands on ex-builders I have lower back problems...Soft mattresses are out...One of my Plates has a super soft mattress,the only way I can get her off is to put her sideways,with pillow under and legs dangling,I stand up on the floor for leverage...But it is whatever works for you...At this point seems sensible to ask for female comment? LOL.