Jib sheets and barber haulers.
I've looked over the pictures in your old posts and am puzzled about where the jib is sheeted. See first picture from
this post:
I see a blue line that goes across and is cleated
below the coaming. It is not clear to me where that connects. Some people have their spinnaker sheets below deck, but the blocks for yours seem to keep the spinnaker sheets above the deck. So perhaps that line is for something else. If it goes somewhere we can't see in the pictures you'd need to give some more info.
At about the same location there are cleats on top of the deck. I suspect that those are for the spinnaker, not the jib, because they are placed too far back for a standard sized jib (unless yours extends much past the mast). The normal setup on DS1 would be a set of short tracks like these, on the inside of the coamings:
In the first picture, you can see where these tracks extend a bit forward of the seat tanks (red). You can see that the standard sheeting position is much further forward from the cleats that are on your decks (hence my assumption that those are for the spinnaker). If true, your boat would be missing the jib fairleads and cleats. I do see the two small black V cleats for the barber haulers on the edge of the cuddy top. Those should contain a line that ends in a block, through which the jig sheet runs, so you can pull it further inboards when sailing upwind (about 6" inboard of the coamings in nice winds in the +-10 knots range, less in either lighter or stronger winds).
But, unless your jib is oversized, your fairleads need to be near the forward edge of where I'm showing this for the track (or on a track that allows them to be brought back). If they are in the correct position, your jib will "break" evenly, that is, when you luff up, it will start bulging inwards a bit, but evenly across its height, indicating that the entire jib was trimmed right.