I first noticed Simon's radial cut sail on a video he posted on Youtube, and fell in love with it at first sight. It looks amazing off the wind, and I am curious as heck how it performs going upwind.
I did rig a tight traveller, but I had to make mine easy to release, as my mast drops into the slot in my transom, so the traveller has to be slack for trailering. I'll take a picture of how I rigged it later. My inwales around the traveller were getting mashed by the traveller block, and the sheet was being pinched against the inwale, so I tied a couple of soft rope coil bumper spacers to hold the block off the inwale an inch more, and that should solve that.
I used to have my terminal boom sheet block be one with a becket, but I got rid of that and spread the return out on the boom, because when it goes back to the becket, and you are sailing with a slack sheet downwind, sometimes the sheet hits the water, and it twists around itself. Very bothersome. I know this is a poor description, but suffice to say, it's better to rig your boom clew end sheeting like Gruff was rigged (spaced).
To see the vangouthaul, check the vid I just posted. I wanted to be able to adjust my outhaul on the fly, so I ran it under the boom to a block aft of the mast and down to the deck, through a 3 to 1 block arrangement. It works great, and has a secondary quality of providing a bit of vang (good), and the tertiary quality of adding to my boom bend (bad). Hence the creation of "the slab" was paramount. I use the vangouthaul all the time. For pointing in fifteen knots, I had it cranked tight, and left it that way when I fell off the wind for awhile. When I did let it go, (it has a stop), I swear that the boat was a smidgen less happy, as a gust created lift in the sail (vertical lift) and heeling force , (just a smidgen though, hardly noticeable), while with the outhaul tight, and downhaul still tight, a gust only pushed the boat faster with no change in heeling force, as the sail was being held tight as a drum and could not billow.
For survival pointing in heavier air, I was very much paying attention to Bruce's points about boom lift on sheeting out power dumping, in that if the boom was lifting, then sheeting out a bit in the gust could create more power, and not help the situation. This I did not notice at all - sheeting out a tad did exactly what I wanted, dumped air and power, and kept me dry. My vangouthaul may have been preventing the boom from rising as it was way tight.
edit: Now that I have a stiff boom that can stand the force, I'm going to upgrade my downhaul by cascading a block. I would have already, but I used up my whole spool of spyderline. Rats.