Limitations on special Boeing 737-800 series

[plain-plane]

Let me see if I can get this right.
FR used to fly with a 1,3g stall margin
Then, a little while ago that was changed by FCI to a 1,5g stall margin.
As of yesterday that was changed again to a 1,45 stall margin.
In effect this means that most FR flights now wants to fly at 350 and 360, instead of the usual 370 and 380. Note that most FR flights are flown at very similar weights.
I do not think all standard flight-plans have been changed to reflect this. (those flights actually filed, and flown at those higher levels.)

I understand that FAA registered aircrafts are normally allowed to fly at 1,2g stall margin and the normal limit for JAA operators is 1,3g. Am I correct in this?
One last thing is that with winglets the optimum and maximum levels are much closer than with the standard wing, leaving less of a buffer zone.