Interesting. the difference in Phrf is 3 between a 163 and ~155; But IS an OPTIONAL OD CHOICE at the OD Level? about a 2% difference? 3/138

At 10 kts the 163 is optimum and would be difficult for a skipper to want to handicap himself.

but what other elective options give us a 2% difference?
kevlar vs dacron Genny? ditto Main? ditto burnished bottom?
ditto oversized pole? ditto having an 18 lb stove allowance?

perhaps we should just extend the list of 2% performance options to mainsail fabric and let it sort itself out?

If we are looking at sail cost ... the fact that the class went to tech gennies was perhaps a more costly maintenance move than it would be to move to tech mains.