You are changing tack anyways, just make that part of your routine if you want. As you are changing sides, just give the ropes a little tug. It doesn't take much, just enough to center the mast and let the wind do the rest.
Again, only needed in light winds.
BTW, just me being me, if the wind gets too light, I have to be in a rare state of mind to stay sailing and not douse the sails and either just sit there or power up and cruise for a while, even at only 6-8 mph.....
Maybe it's and age thing.... not much patience to just sit there at 2 mph with the sails up......
G
