On the F18, we change quite a lot from upwind to downwind depending on how intensely we are racing. Downwind we do the following:

mast rotation to 90
mainsail outhaul gets loosened a bit
Boards come up about 12" (since we don't need windward lift anymore but we still want the boat to track straight)
jib gets eased
downhaul gets eased if we're not overpowered

I'm still working with the mainsail traveler position I see most leaving them centered but I really don't think I get good flow with it centered.

All of these get reversed for going back upwind.

As far as furling the jib, generally we do not furl it but do ease it and trim it to fly tales. If it is extremely light, we'll sometimes furl the jib if it's just hanging there.