not in this instance, he runs a BD1000 fosgate. I suspect your deck or radio mounting. Since his car hits over 140 I highly doubt that you 1 12" JBLs are louder. And they definlty don't hit harder then 3 10" eclipse aluminums.
Just so you know i am an MECP certified installer, and haveworked for Tweeter for almost a year part time in the install bay. Full time I work for a system integrator and assist in audio design, install and trouble shooting in professional envirnments.
pull the radio out of the dash and hold it, then play the tracks that skip it. If it still skips its the deck if not its the mounting.
By the way what mono block amp are you running?