Wouter,
When calculating downwind sailing, you say "as low as you can go." That means straight downwind. Is that what you mean?

Also is this the correct order of these three items? Well, I mean are the items in the right order but are the numbers on the wrong ones?

-1- is most impacted by righting moment and pointing ability.
-3- is most impacted by having a spinaker or a jib
-2- is mostly impacted by good hull design and efficiency of sailarea