My wife is tall. Her shoulder blades are above the backrest and she gets whiplash action from accelerating. Our '07 seemed to have a taller backrest and she didn't have this problem. Wondering if there is a solution. Building it up and also changing the angle so she sits up straighter. A little more cusion on the bottom and she will be happy. Love the new bike, just need to make sure she does as well. Thanks four any help.