Right Luiz when you are looking at the DIRECTION that the HULL transom is moving I.E transom down (negative DIRECTION) – bow up (positive DIRECTION), and visa versa, but - the usable productive lift generated from a symmetrical foil is always positive, (generated on the side that you want the "usable” lift) – it is generated through the inclination of the horizontal motion of the hull through the water and "operates in a direction", either, up or down (positive lift UPWARDS or positive lift DOWNWARDS
In the case of the Hobie 14', I feel that there should be a "static" amount of downward lift generated at the transom when sailing at the, so called, "level" state which will incline the bows slightly up simply to compensate for the lack of bouncy in the bows.
(Basically what is a little confusing is just a case of semantics)
When I said “a small amount” (2 to 3 degrees), it is because, with symmetrical T foils set at or near the bottom of the rudders, there is a certain amount of latitude for the actual angle(s) either side of the “level” which is quite “forgiving”. This is because within a few degrees either up or down of the actual “neutral” setting of the foils, the “real” lift/drag factor becomes progressively very small. (that is untill we look at very high velocities where the percentages are the same but their "effects" become "critical")
(We could make these descriptions REALLY confusing, by including, “pressure variables” into the mix, (I think that we would lose a great percentage of the readers if we did)