I'm trying to design a tandem wing model aircraft with both wings with the same wingspan. The front wing will have 2 and the rear will have 1 deg of incidence angle, also the front wing will have higher aspect ratio. I'm using Clark-Y airfoil for both wings and active yaw stability will be achieved by differential thrust.
I calculated the neutral point with this website as it gave nice flying results for my older designs.
Usually tandem or canard airplanes have their front wing mounted with a higher incidence but because the front wing has the same span as the rear wing, all of the rear wing will be subject to downwash from the front wing, so I'm concerned if the rear wings angle of attack will change considerably to affect its lift.
How will the rear wing incidence affect the neutral point?
Should I keep the rear wing at 1 deg incidence or should I increase it?
Here is a picture of its approximate form