All my Yachts are set up in the following way
Sheet in all the way so Main boom is on the centre line of the hull and CAN NOT be moved left or right,jib is allways one finger out of centre,in other words it is set out off the centre line,sail on jib is usually one finger width of a bow in the sail same for the main,this of course is what I start with,obviously you can let more of a bow in the jib and main as necc.
Dave