Minn Flier,
When inboard flaps are lowered two things change. The camber of the airfoil increases at the flap which makes the zero lift angle of attack more negative and the chord line from the lead leading edge to the trailing edge changes along the wing at the flap in relationship to the chord line along the wing from the flap to the wing tip. The camber change causes aerodynamic washout and the chord line change causes geometric washin of the root which is equivalent to washout of the tip. The combined effect is so strong that the center of the wing must stall before the tip. Because the average decalage is greatly increase too, lots of down elevator must be applied symultaneously to prevent ballooning. With a computer radio it is wise to mix down flap to down elevator so that the pitch compensation is automatic.