What Gill is saying is just ease the Main enough to get the Tell tales to fly properly, which isn't much. The main will stall if you don't. It will help to drive the boat better.

Most of the masts that do break with the spin up are in the most extreme cases. For one instance, going downwind, stuff the hull, the main comes uncleated(eases out a LOT) and you stuff the hull. Another one is you capsize, and the spreaders aren't centered on the diamonds and then once you sheet hard going upwind the mast breaks. That situation is resolved by putting some epoxy about an inch above and below where the spreaders are connected to the diamonds.

Again, the most extreme cases....


Mike