Another way to lighten up and regain that «lost» acceleration is to switch your current tires. As said above, the weight of tires varies a lot from one model/brand to another -- just check tirerack.com to see what I'm talking about. Also, there's a pretty big variance depending on the width and profile. Plus, since the tires are on the outside of the wheel, there's more weight to be put in motion, affecting acceleration too. What you could do would be to change your tires for a lighter model or something a bit narrower. An added plus would be no rubbing. You can also go for a lighter set of wheels and use spacers to get that stance.
GL anyway !