I included three degrees of right thrust and zero degrees of down thrust (with Ernst Thrust Plates) when I built my UCD 60 with the OS FS 91 w/pump. I checked the thrust angles by flying over myself and going throttle on and throttle off and it seems to be right on. I haven't been able to hover very long with the UCD 60 yet (new engine is still too rich), but my attempts at it don't seem to wander left or right with the throttle. I notice that I need a bit of elevator during a knife-edge, but I don't think that is a thrust issue.

You can see the Ernst Thrust Plate in the attached picture.