Trackball

Ok, this is not your run of the mill trackball question... it relates to the scrolling... My trackball's fine, it rolls beautifully and my file free is nice and high - no lag. So here's the situation: When I'm texting and want to select a different word with the exact same keystrokes (I have a pearl) It's shoddy trying to scroll down to my desired word. I have to try multiple times, trying to get down the list; sometimes it takes 7-10 seconds for it to respond. Does anyone have any insight as to why I have difficulty only scrolling to alternative words within SureType?
Thanks.