[DKjens]

All aerobatic bipes I've seen have had instructions for about 1 degree negative in the top wing. I think it may have something to do with the fact that the engine thrust line is so far lower, that you would normally put down thrust in the engine if the top wing were the only wing, but since you also have the low wing, which is not as far below the engine thrust line and usually set to 0 degree incidence, ot the same as the engine, you put the negative in the top wing. I would at least try to get some negative in the top wing.