Sail is set up with an adjustable outhaul. When going downwind I loosen the out-haul. When rounding the leeward mark, is there a reference on how much to re-tighten going upwind? Is it just by feel?
The generally accepted practice is to use a permanent marker to mark your normal upwind setting on the boom by the clew and tighten it to that setting when you round the leeward mark. Some people mark their lines with a marker instead.