Markoz, thanks for the answers.
Stangely i've saw a friend's MD-11 going smoothly at x8 (he goes back to x1 for the turning points)

I was asking because my 767/757 used to fly well in x8.

Pinatubo,
I can save flights with the 707 and reload them after, but I never succeeded in saving a flight with the 767, can you do an "how to do" for the 767?