I like the two line system because at A mark, when you pull the tack out first, you have also pulled half the spin out, so when you pull the halyard it comes up really fast and easy. And when sailing Uni, on the douse, if something happens (traffic!) where you have to stop snuffing for a minute to...um...steer (!) you won't shrimp the spinny, the tack line will keep the foot up out of the water and you can finish the snuff when you have it under control.

Yes, it takes a few extra seconds to pull the tack line release on the douse, but it keeps it simple and easy. And yes, a bigger radius block (in any application) will allow the line to run through it faster with less drag.

Pete, after Tradewinds someone handed me a trap handle with a ball hook on it for you. If you need it right away I can send it.