Incorrect, the position of the solenoid pack does make a difference, as it switches current down a Field winding wire (F1 or F2), back up the other field winding, then through the Armature windings (A) to earth, i.e. using all three wires. That means the distance between the solenoid pack and the winch is always 50% 'longer' than from the solenoids to the battery.
Incorrect, all three poles are in use, that's 50% more resistance.
On new, clean, corrosion free connectors, resistance may well be negligable. a little bit of dirt or corrosion leading to reduced surface area will increase resistance over time, and that will hamper performance.