I land my planes the same as when I was flying full size. In other words, when you know that you can make the runway with the right amount of speed then chop the engine to idle and float it in. Don't forget to start adding in up elevator to flair just before the touch down. If you need to have throttle at 25% to make the runway means that either you are too low, too far away, or its really windy which slows down the plane too much.