I would suggest you not use flaps at 45 degrees. Anything beyond twenty degrees is just Drag and that will increase handling difficulties exactly the opposite of what folks tend to think. An awful lot of nice airplanes have been destroyed because of an over reliance on flaps. Contrary to the common belief that flaps make a slower approach easier, its just the other way around and makes things more difficult. They do allow for a slightly slower approach but doing so requires requisite increase in pilot skills also.

There is no reason to use over 20 degrees on that airplane.

John