It needs to be 180 degrees at the apex and not half way down the loop portion. Make sure there is a vertex right at the highest point and that it's set to 180 degrees Also you're putting WAY too much banking on WAY too soon. It should be a smooth transition and not a massive jerk.
If I were you, I will cut Griffon's immelmann off as a element
[:D][:D][:D][:D][:D][:D][:D][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)][B)](Beaten up by CC members)