Fatigue is your enemy. Many of us still have to work our own mains and I've even moved the cleat up so I can't cleat it from the wire (keeps me from getting lazy) so at the end of the day I'm still looking for extra purchase and I have 10:1 on my F18. Good news is I'm sailing more and more with crew that expects to get the main which is soooooo nice! Maybe I'll drop it to 8:1 cause all that sheet in my space is annoying. :-)