Nikki-from what I've read, the back to sleep thing isn't completely bc of the being able to turn the head. It can also have something to do with the developmental stage of the brain stem and some kind of apnea reflex. Meaning the baby can stop breathing, even with an uninstructed airway and the brain won't tell the baby to breathe again. That being said, there's a line between what recommended and what keeps you sane. We sleep on back for now, but inclined, which isn't recommended either. Talk to the ped and decide what's best for you as a family.
Also, when a baby is placed in they're tummy, all the pressure is pushed towards their back, making their belly a lot more comfortable, (this is why this position helps a lot in calming a gassy baby). When laying on their backs all the pressure goes to their tummy, so it's understandable why the babes are for sure more comfy on their tums!