Luff tension on the chute should always remain the same unless you need to reach for some reason, in which case you can loosen the tension slightly.

It light breeze, when you are sitting on the hull it pays to talk the boat just far enough back to get the tips of the bow out of the water at the water line. This will reduce drag in the tack. Move back forward as quickly as possible.

It does not pay to rotate back in light air. Set the main up for maximum air flow around the mast. You are not trying to reduce drag, you are trying to increase lift in light air. However, never over rotate to winward. I would say max rotation on the wing mast in any condition would be the side stay or slightly behind. You can mark your tramp with stitching or white paint to give you rotation reference point rather than eyeballing the angle.