It's very great game so far until I got stuck on this really stupid minigame

. Its this carrot minigame where you have to tap pieces of carrots within a one minute time limit. The problem is most of the time i have to hit a blank space next to the piece of carrot because when i directly hit it it doesn't respond(this usually happens in the middle of the touch screen). I have a
ds lite now and i had
ds before and both of them don't have great touch screen control(ex. making patterns with the sylus in acww). Is this a common thing for most
ds's, or do i need to get a dsi? Does the dsi have more precise touch screen controls than the
ds or
ds lite? because every video for mario and luigi has a dsi being used including the carrot minigame video on ign or gamespot. I would appreciate it if someone could help me out.