William, some observations...
looking up the mainsail in that picture, again, you don't want wrinkles--a tighter halyard's needed. Look at the draft stripes, especially the lower one. It would appear that you have a pretty full belly in the main. If the wind is light, you want to flatten that sail more to improve attached flow. Tighten your vang too to bring down the boom for a flatter sail. A Cunningham will move the draft forward as well.
Also, there's a strange bump about a foot back from the mast--possibly getting back wind off the jib affecting the draft slot--too much jib leach tension or sheeted in too far.
I also noticed the mast end of the boom end is below the class design stripe--is that the original mainsail or a replacement? Could be a tad tall for the rig.
looking up the mainsail in that picture, again, you don't want wrinkles--a tighter halyard's needed. Look at the draft stripes, especially the lower one. It would appear that you have a pretty full belly in the main. If the wind is light, you want to flatten that sail more to improve attached flow. Tighten your vang too to bring down the boom for a flatter sail. A Cunningham will move the draft forward as well.
Also, there's a strange bump about a foot back from the mast--possibly getting back wind off the jib affecting the draft slot--too much jib leach tension or sheeted in too far.
I also noticed the mast end of the boom end is below the class design stripe--is that the original mainsail or a replacement? Could be a tad tall for the rig.