Staysail Lead on Cutter Conversion

[lobodoug]

I am converting my Morgan 461 into a cutter rig (currently a sloop w/a high aspect rig and large foretriangle). My problem is figuring out how far off the centerline to set the staysail leads. I have read of one method: the angle from the tack to the fairlead should be 10 degrees from the centerline of the vessel, but this has been only in reference to dinghies. Is the same a good rule of thumb for larger boats? The 461 is a cruising boat with a long fin keel, not particularly deep, and 13.5' beam on a 39.25' wl., so is not exactly an upwind machine, but I hope to improve her performance upwind (currently limited, I believe, by the wide sheeting angle of the genny, lead outside the outboard shrouds). Any help would be appreciated. Thx, Doug