I'm comparing to a Gaudius to which the owner has made some modifications, and about a programma like P11 or P13, which has lots of long straight lines in it.

The Gaudius is WAY more stable in those than the WindS. As I understand from it's owner, the 'vanilla Gaudius' has issues with directional stability, the solution for him was to attach a small tube to the front of the vertical fin, which immediatly solved his issues with it. In the air it's as stable as, for instance, an Oxai Azurit or Axiome. The WindS definatly isn't, no matter where you put your CG. I have seen this stability issue in other WindS'ses as well.

However, as with a lot in our hobby, it's also a matter of perspective. I'm just reflecting how I think about it, and that offcourse doesn't make it neccesarily the truth

I started out with the wing as provided (did check if the incidences were equal) and quite a forward CG (more forward than Seba recommends). Before starting to change anything, I want to know how it flies, so I flew 100 flights with it and then changed the incidence on the wing (lowered it) and moved the CG back, a lot, which in effect made it more stable, especially at low speeds.

Speed is offcourse a relative thing, so maybe we're talking about different things here.

Howmany flights did the persons that you mention fly with it?

It might also be that your extra weight, brings you the stability.. that's also why I say not to build it light.. yours is 300 grams heavier, which is a lot, especially in windy conditions, like we always have over here.

At the worlds: were those the versions with wood wings/stabs?