I love bipes so many of my planes have been just that--BIPES--. On all of them ( 7 Airomasters, two Phaeton 90's, one Phaeton 40, two large Lazy Aces, one smaller Lazy Ace) flew best by having the upper wing set at about -1.5 degrees relative to the lower wing. Just a minor change of 1 degree or so can turn a doggy flyer into a real pleasure to fly. If you can, when and if you go to a bipe, make sure that you can change the incidence of the upper wing easily and then just try out some minor changes. I think you will be surprised by the big change in flight characteristics you get with minor change of incidence. I also found that proper engine thrust line had quite an effect. Most of my bipes all liked about 3 to 5 degrees downthrust and about 2 or 3 degrees right thrust. However, some bipes do like 0/0/0 on surfaces so first, go by the recomended settings but don't be afraid to experiment with minor changes.