My A-Flex setting is 2
One thing I did different is sleep on the bed vs the couch.
On the couch i am either sitting up or on a side since is kinda uncomfortable to do any other position, however I seem to get much better readings and a better sleep.
Our bed is soft and with plenty of pillows, I sleep on a side but there is no telling I roll on my back at night. I am starting to want to blame our bed.