HeliHead,

When settings are restored to...

100% travel in both directions on all servos
Pitch curve 0, 50, 100
Half stick
Centered servo arms all at right angles
Swash at center of travel and level
Mixing arms level

...the pitch is +10.

At full stick, it is +16.

I don't think there is any way to lengthen or shorten the arms that much.