Hook,

You are correct that the wind shouldn't affect the spin since the plane would be moving with the air mass - unless you are trying to enter the spin from a line parallel to the flight line and centered on the judges. Then you have to make some heading adjustments to make the entry look correct from the ground. Also, the exit has to have the wings perpendicular to the flight line (1 downgrade for each 15 degrees of error). So, a contest spin becomes a ground reference, not wind reference, maneuver. That's part of the challenge. In such situations a left or right entry may have appearance advantages depending on the direction of the cross wind.

Jeff