I run an additional set of ratcheting blocks inboard directly abeam of the secondaries. So the lines start at the spinnaker, lead aft through the tweakers (twings) then to non-ratcheting blocks on the aft padeyes. The lines then move inboard back up the rail to the ratcheting blocks then do a 90 degree turn onto the cabin top secondaries. I find this extra set of blocks keeps the cockpit a little tidier and keeps the crew from doing the "spinnaker sheet limbo". In honesty these came with the boat when I bought it, but I find that the system works quite well.

Here's a photo for reference...
[Linked Image from farm4.static.flickr.com]
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Dominique Labrosse
Red Five, #92