Those lift off speeds for the PA28, I'm assuming a Warrior, that have been mentioned seem excessively high, I would expect to be airborne at 55 knots or thereabouts although I would unstick an Arrow at a slightly higher speed.
Unless I'm on tarmac/concrete I always hold full back stick/yoke when taxiing in or out in a trike and have back pressure (rather than a large movement) on the take off roll for the aforementioned less stress on the nosewheel reasons. Although for sticky/long grass fields I would use whatever technique the POH for that particular aircraft stated.
Re holding back the stick, I seem to remember the mighty Phantom was full back stick on the take off roll.