In light air.

[Bob Brunius]

Upwind in light air:

Heel: Many have said to induce heel to reduce wetted area. Question is which way? To weather or to leeward? Heeling to weather in light air makes the sails look terrible. How much heel? As much as you can get with the crew all on the same side?

Main Trim: My leach tell tail on the main stalls when the sail looks way under trimmed -- lots of twist on the upper batton. What should I do with it?

Downwind in light air:

Do you see boats sailing wing on wing? Which way heeled to do that. Preventer?

[Travis Gregory]

Hi Bob, we sail in light air often on the Great Salt Lake.  We most commonly race 2-up for this reason.

Heal the boat to leeward so that the sails use gravity to stay full and you get some wetted surface out of the water.  We will  have both on the leeward side or the skipper sitting "in" on the windward and the crew on the leeward side.

I travel the main up to about 3-6 inches from the windward side and sheet the main in so that the boom is centerline, but not tight.  To much and you should feel the boat stall. Play with this a bit and you will feel where it's fast.

Downwind - heal to windward a bit so that the chute rotates out to windward.  Have one of your crew stand in the companion way or sit up by the mast and hold the boom out.

I haven't used wing and wing much except to sail a tad deeper at a mark rounding or to be on starboard without a jibe.

Hope this helps, sail fast!

[Don Corey]

Travis's comments are good on heel.  To me weight way forward in light air in as important.  Skipper against cabin top with one or two crew on leeward rail well forward.  Downwind in light air as well, weight well forward, should never hear gurgle off the stern with fanny out of the water. 
Good sailing, go fast!

[Tac Boston]

all of the above suggestions are great, one thing that I have been playing around with a bit is having the front person stand up at the mast (facing aft), and move back and fourth depending on heel angle wanted. This does a couple things, makes it easy for him/her to shift weight quickly from side to side and also puts their head/eyes higher in the air to be looking back for breeze lines. You see the star boats and the viper 640's doing it all the time. Copying is a form of flattery right? 

[Bob Brunius]

We've been having great luck in the light air this summer. Healing to leeward helps a lot. Less wetted area. Even down wind when other boats are having a hard time getting their kites to fill we heal hard to leeward and the kite takes a shape almost without any wind. Slight puffs attach quickly that way.  Thanks for the help on that.