I've only been flying heli's for 16 yrs but none of mine require 75% of the stick to hover just because 0* is at mid stick, i fly mostly advanced 3D and the sticks are 90% of the time between 40 and 60% on pitch. collective is ONLY to give rise/fall/holding all flip/roll/tic/toc/etc.... is done at 0* with cyclic only, one side of the rotor disk is pushing while the other half is pulling so you don't need or use collective to accomplish the maneuver only to give the 'bump' prior to cyclic input and hold it at the correct altitude after it flips.

kc