I realy have no clue to what I'm doing, but!!!!!I use various sized washers and add right and down untill I feel the plane tracks well.Fist I fly flat and level and trim the plane in as best as possible.Then inverted (A plane like this should need little or no down input).If I need too much down.Iuse a washer to add down thrust.I then fly sraight and level and pull vertical add full or 3/4 throttle if the plane pulls to the left I add washers to add right thrust.So far so good my Aresti,with a61bb and 4oz of tail weight,tracks extremly straight.Knife edge seems to need some extra speed to perform and looks hurried on the 4 points.
I'm putting a satio 72 on another.I'll let you guys know how that works out.I hope this helps1