The Rafikis were certainly built to a very high standard. I've owned mine for three years now, and am even more impressed now than before we bought. Our boat also came with a near-full set of blueprints (signed by Stan Huntingford), so I know how strong and solid these boats are. I don't know how the Rafiki 37 morphed into the Slocum 37 (different builder
? Different company?), but I would assume you have a heck of a boat.
Our came rigged with a self-tacking staysail. It rides on its own boom, and slides on a rail track. I can try and find a pic if you like. I'm thinking of installed a second furler
up front, but thinking of carrying a Code-Zero sail ... not sure. In any case, we currently have just the one furler
for the yankee. We usually fly a 125%, which seems to be more than enough most of the time.
I wouldn't be too concerned about the hobby-horsing. It seems to be confined to a specific wavelength and steepness. Once we get shorter or longer waves, it disappears. And as I say, I've learned to just keep the power on, and no problem. Overall, I am very pleased with the sailing characteristics.
I've never been pooped in this boat, although that may be combination of luck, skill, and
the boat's characteristics. I've read much about how double-enders "parts the red sea" with a following wave. I'm not sure I believe it, but I can tell you she does well in a following sea.