Hi Steve

Here in Switzerland sometimes we have races in almost no wind. Telltales in the sail, in super light air don't work! They stick on the sailcloth. This can be reduced by using sail-lube for the telltales.

My solution for not over sheeting the main is, that I use a light air mark on the sheet. You have to practice, to figure out the right place for the mark on your sheet.
An other good indicator are the back-telltales on the leach of main, they shood fly about have of the time (in light air). Also good are long (3 feet) streamers of videotape (VCR) from the bridle wires. The position of them is so, that they point to the backside of the mast, when close to the wind.

Hope this helps...

The more wind the more fun!
Greetings from switzerland