I know on my S&S design (Columbia 29) the mast
is supposed to be raked 8.5 inches. Perhaps your mast was supposed to have that rake (or maybe none?) and had too much; that would be my first guess. More of the main's area aft rudders the boat
upwind (weather helm as you probably already know.) Also, how much heel did she have at the time? I know I benefit from reefing early enough that I keep the heel under 25 degrees.. really 20 being better. Too much heel and you're just using the rudder
as a drag brake...
Oh and in that picture it looks like they are overpowered with that genoa
going upwind. I know with mine I just get more drag and heel and not much power from the genoa
and switching to a "working jib" I get the same speed and less heel. But more heel is more dramatic for the photos
Also my mast pumps too but it's just something to live with, unless you want add another set of lowers which a lot of folks do. I haven't yet. Someday I might, but the boat
is 57 years old so maybe I'll get around to it one of these decades.