The only problem with flap is that it will increase downwash and take away some of your airflow. When you straighten up, the keel surface, the fin, will become turbulent, loosing rudder authority.
Less flap will give you better control for longer.
Too much flap in turbulence may be too stressful and the wing will stall at a lower angle of attack, which with gusts from underneath, is not good.
As was mentioned before...forget who, every approcach is different. Apply knowledge and feel what it is doing.