I was reading Rick + Mary's Catamaran Racing: for the 90's and had a few questions about mast prebend. How tight should I make the diamond wires? Do I need to use a tension gauge to get them even? Are the spreaders on the H-18 raked back far enough with the stock setting? If not how far back should I rake them? After sailing should I loosen the diamond wires? Any input would be greatly appreciated. Thanks, Bob.