Re: Topping lift loads?
1/8" amsteel has a breaking strength of 2300lbs and makes a great topping lift. The small Harken carbo block is good for hundreds of pounds, which has been enough for my topping lift.
7/64" is more than strong enough too, but it's a bit harder to splice when it gets that small.
My main sheet is left adjusted so that it is slightly longer than the leech of my sail, and so it is slack when you are out sailing.
boats that I sail on regularly: Pearson 28-2, Rondar 505, Yankee 30, Blanchard Junior