ok C101
On the basis that agitation of the water won't affect the fish-less cycle I'd just have a play with the 3 options, see what's best for you and use that. When I was running the stock filter on my Roma I used the setting where output was from the top with the venturi valve just ever so slightly opened...a setting just before lots of noise occurred
I put it on the setting that sprays across the length of the filter, apparently its best if you have plants, and so if i'm going to have plants i thought i'd just leave it on that one. I guess it doesn't really matter that much what I choose whether theres i'm cycling or not, they all do the same thing, just that the nozzles might be a bit to harsh on the plants