Aeronaut is right. Believe me, it's just the way that Giles' like to fly. My 60 size Giles would do it all the time when I pull back too hard while none of my other planes do it at all. I think it has something to do with the swept wing. You can try minimizing the elevator throws or adding expo. There are LOTS of posts on this characteristic/flaw in here. Do a search and you'll see!