In regards to the safe combo itself, turning the dial all in one direction isn't going to help for similar reasons as stated above including the fact that once the flys pick up, the pack will be turning as a whole.
That's why I said:
Spin it back and forth a few dozen times at speed.
I mean spin it ten times one way, then back the other way ten times, for a total of a few dozen times.
I figure this would heat/wear where the actual issue is, and perhaps let it dial in properly.
Anyway, OP, any luck? What have you tried so far?