all twins are lumpy its just the way they deliver there power its all low down power and nothing at the top end stop trying to compare to a 4 cylinder .
I've got one and I can shift it smooth as an automatic. I came from inline 4s and it took me a while to get it down. A flash and a pipe will do it ALL the good.
If your passenger hits the back of your helmet with hers, you are not riding smooth enough or at least give her a warning that you are gonna jerk the bike. And you both have to learn how to get on and off this bike. Wait till you are older and you will know what I mean.