perhaps you best bet is to either get a copy of the rigger apprentice and study up, or to call Brions shop for consultation.
on most boats that size we use the harken large round padeye, and harkens 75mm ESP fiddle and fiddlebecket cam blocks with 7/16" sta set line, and the runner of 5/16" dyneema- covered. that is of course when the folks want the block and tackle kinda runner.
the other option is a runner of 5/16" dyneema to a single block, then a control of 3/8" dyneema that deadends on the rail, goes through the blcok on the runner and then through a block on the deck and to a clutch then winch. Use either Karvers blocks for this setup, or harken blackmagic hiload straphead blocks.
you might get lighter weigh hardward , but somebody needs to run the math to determine if that is all correct.
I thought the old runner rule was 1/2 way from the mast to the rudder post....
