The right answer is "it depends"

On the jib sheet. Mine is 84sqft. If you think you can trim that jib in 20kts on a 1:1 purchase than be my guest. 2 harken 29mm blocks on the jib clew and 20 feet of extra line is all it takes to make that a 2:1 purchase. I'd recommend you consider it. I have young and novice crew so lighter loads is a good thing. As for continuous, if you get the length right it makes the cockpit easier to deal with. Grab the red line and keep pulling is a lot easier then just about any other instruction. The trick is to start long and keep shortening it until it's just right with only a little slack on the floor while underway. If you have roller furlering then continuous sheets are that much longer and more mess on the floor.
On the jib halyard, mine is 1:1. The trick with the jib halyard is that it's can become part of your rig tune. As the wind pipes up you put more bend in your mast with vang tension. This has the capability of loosening your shrouds and lowing your head stay tension. So you really want to be able to adjust the headstay. However, you may choose to use the jib halyard to make that up. And you may need both if you add headstay tension and then need to trim in the jib to clean that up. Jib halyard is also easy to make 2:1. Come off the mast at a turning block, go outboard to a second block and then head to a cleat. When you need the 2:1, add another block between the first 2 and run that to purchase. Need tension, just give it a little tweak.
Main halyard, mine currently is 2:1 and I'm going to probably swap that to a 1:1. Hoisting hasn't been an issue and it's easy enough to try with a 1:1 to see if it's an issue. While under way it's 2-blocked so there is no real advantage while underway. It's not like there is enough load to really stretch the halyard but the theory is that a 2:1 cuts your load on the halyard in the mast by 50% so it's less likely to stretch. 1/4" vectran isn't going anywhere with the loads on the i550 so not an issue. If the halyard were smaller stuff, then maybe it would make sense. I'll take a higher hoist this coming season.
Spin pole deploy is 1:1. No issue with this. It was a 1:2 setup that also sucked in the tack line but the system wasn't very smooth it was complicated. I changed it out for a simpler setup with separate tack line.
spin tack is now separate and is 1:1. If you preset the tack line prior to set then you don't have to touch this during a hoist. Also allows you to fly the spin a little looser in medium conditions which give you a little more rotation to windward.
Spin halyard is 1:1. no issues and a 2:1 would just give you 2x as much line to haul in.
Outhaul - primary 2:1 at the boom end with a secondary 3:1 in the boom giving me a 6:1 total purchase. This seems to be a good answer and allows for adjustment even when under load which I consider to be a good answer. If you can't adjust it under load when you need to, then you won't and you'll get into trouble. On the open 5.70 you have to tack to add outhaul because there isn't enough outhaul purchase.
Cunningham - 2:1 primary and a 4:1 secondary for a 8:1 total purchase. Don't really need 8:1 but it's rigged and I see no reason to un-rig it at this point. Plenty of purchase under load which is a good thing as discussed.
OK, now the $64,000 question. Do you have a traveler or a bridle? The trade offs are bigger then I realized because you need a "ton" more vang with the bridle then you do with a traveler. Just the nature of the 2 systems. My new vang will have a 16:1 purchase and my mainsheet will go to a 3:1. In the past I had 8:1 vang at a bad angle and a 5:1 mainsheet and I couldn't seem to get it hauled in enough with the main sheet to get the vang tension on hard enough to keep the main depowered so in a puff you release the main a little and the main powers up even more so you have to make a big dump and then real it in again. This was not fun sailing imho. New setup will have a lot more vang power and a much better angle which will translate into much better control under load.
Note. vang loads bend your mast while traveler loads will not. So how you work this will effect your sail trim. What works on a bridle boat sail wise may not work on a traveler boat because of the impact of vang loads on the mast.
2nd note. with a cabin top maststep I only had about 20" of mast to "bend" with my vang load. The mast has extra carbon at it's base making it pretty much impossible to effectively bend the mast with vang loads. My new setup will move that vang load point up the mast so that I can effect sail trim with vang loads (and control that impact with check stays).
Cheers, Kevin.
p.s. It's 55 here today so spring temps are headed your way.