PAXboy
I'm not in a position to do a practical check anymore but I would have though 6k-7k for cabin altitude is much more typical than 8k.
Whilst cabin altitude does vary a little in the cruise it's mainly a function of cruise altitude and in any event the crew wouldn't be altering cabin pressure in the course of normal operations.
Crew adjusting cabin zone temps ? Possible, used to happen occasionally but it wasn't widespread.