I generally respect a posters request and acknowledge that your request was to owners of that particular plane. With no answers coming, I'll offer that on a bipe, 0 on the bottom and -1 on the top is not unusual. The stab often suffers a down force couple from air off the top wing that will make the plane climb excessively with an artificial positive incidence forced by the couple. A little negative in one or the other wing counters that couple.

With it often harder to add negative to the bottom wing, it is often done on the upper because it is easy to shim the incidence adjustment by trial and error. On the bottom wing where the forward dowels would need their holes adjusted or the wing saddle shaved, trial and error is more difficult hence the bottom wing is often fixed at zero and the adjustments done to the upper.