I have the problem on my old Aeolian pumper mostly with the thin,
slick paper used in the last 10-15 years.  I just place my finger
temporarily on the flange of the supply spool to increase the hold-
back tension when playing large rolls.

The Ampico B spoolbox has a variable drum-brake system on the supply
spool shaft which increases the hold-back torque as the diameter of
the supply spool decreases, thus maintaining a more constant tension
in the paper.  It's not a perfect solution, but it helps when
playing Jumbo rolls.

Either way, the drive motor must have plenty of extra force
available, and the tracking mechanism must have plenty of force
_and_ excursion travel, to keep working properly. No leaks allowed!

-- Robbie Rhodes