This is what is meant by trimming. If whatever is a problem you must do what it takes to overcome it. This will vary with every plane and doesn't matter whether its the plane or the sim it has to be trimmed by you. Perhaps you are banking too steeply? Or reducing throttle too much.To learn all of the varied things that are required takes years of trial and error. These forums are great but it's you that has to obtain experience to recognise and combat the problems.