Rotation...
With regard to the 727...and, please forgive me, since it's been maybe 23 years or so ago since my last flight on the 'three-holer'...but, as memory serves me, the 727-200 dragged the skid at about 10.5 degrees (struts compressed), and the 727-100 did so at about 11.25 degrees.
So, the two techniques used by many were either:
1. Rotate slowly so as to time the strut extension and subsequent lift off when going through about 10 degrees in the rotation, or
2. Rotate at the normal rate (i.e. about 3 degrees per second) to about nine or so degrees of pitch, hold it there, until the plane was ready to fly itself off the ground, then continue rotation.
It normally wasn't a problem, but on takeoffs where we did a Flaps 5 takeoff, you had to be careful. (e.g. Denver on a hot July day...heavy weight...long runway available) With the Flaps 5 takeoff, you definitely had to rotate to about nine or so degrees and wait until she was ready to fly off the runway.
I know this response doesn't directly address the question in the initial thread. Just wanted to add my opinion...for what it's worth.
PantLoad