From what I can gather from the feedback both on the forum and around the traps (Thanks Garry) the raked spreaders are used for lightweight crews to induce mast bend and flatten the sail, sloop rig to even out the loading from the jib and for the spinnaker rig again to counter mast bend loading. In that case I will stick with the 90 degree spreaders on my cat rigged Mozzie. Thanks for the feedback.