Since you are on a computer radio you can dial in all you want. I would start with a little and experiment, then you can program your radio to your preference. May be start with 3/8 of an inch for now. Also if you check along the way, you will notice that you may want to program some up elevator in with your flaps as the nose tends to go down with flap application. Even the most basic computer radios usually have this capability. I have about 1 1/2" of flap on my Sudokhoi (see my avitar). That is too much. I need to tone it down. The plane slows to a crawl for landing without flaps.