Anyone can beat someone who doesnt use the gears properly, If you use the is where its most comfortable (just before the limiter kicks in) you'd Woop alot of cars. you have to be aggressive with it,(IS's are well able for hard shifting and love to rev). they are not that slow. red lining is not that bad. the limiter is there to prevent damage so it limits the engine before it will do harm. so dont be afraid to take it to it.
try that drag again doing as i say and i guarentee you'll leave him sitting, by the way start off with the revs up at about 2000 - 2500rpm.