man! cool to talk to you at least here
my experience with frac rigs is limited to dinghies and folkboats and hobies and the like and my limited experience tells me that frac rigs like to sail by the main and respond better to the main than a masthead rig, they also sail more like dinghies...
case in point my islander has a very small aspect main, bendy stubby mast with inline spreaders and will sail slow if using anything less than a 130 genoa...big overlap etc...
I have noticed that many 70s boats were all about the size of the jib with little importance given to the main
contessa 32, islanders,yankee 38, almost any ior boat of that era
in any case today Im completely lost in all the variations as Im always stuck boat wise 30,40 years back unless were talking dinghies...
anywhoo back to rigs