djpil, you're right - the cg makes the biggest difference to stick posn at the stall, but for most side by side two seat
light singles, the c of g does not vary that much day to day.
Also if you have any significant "back elevator" at the top of a loop, you are flying an egg shaped figure. You will stall the wing at the top if you pull back to the "stall" position, and on the way down, if you pull to the same posn the wing will also stall, assuming you stay within the design envelope. One other point, the stall warner is not a speed dependant device, it is an angle of attack indicator.