Bill, if the plane has been flown, what elevator trim is it showing? Are the power on and power off trim positions the same?

The four degrees down thrust was added to compensate for too much climb under full power or is that down thrust standard for the build?

If the elevator is close to neutral trim and the power on/off trim are the same... then all is well. Very often however if the elevator is not near neutral... power on/off trims will not be the same and can be made so by slight incidence adjustments. Caveat... remember always that the first step to trim is balance and incidence adjustments should not be made until the balance is correct.

Generally a wing can be shimmed slightly and in the case of your low wing Kouger, the front would be shimmed down by elongating the dowel/s holes and then adding some weather stripping or something to the forward saddle.