Just because the bike is, er was, new don't think that for a minute it was un-crated correctly or assembled at the factory correctly. Loads of members have found their air mixture screws bottomed out (under the old epa caps too). Dealers don't care enough to un-crate or do anything else but hand you a bill and take your money. Try balancing your carbs first. The early days of mapping had lots of fi bikes running below par. Throttle response shortcomings have no easy direct answer. Some have drilled the slides 'hole'. (standard for 07 models now btw) Tuning the carbs after rejetting and more open pipes can cause your issues too. Spacers under the needles,different needles etc.
