I'd be happy to show you guys how to slow it down. Piece of cake. No need for any weight. I used to run my 10 teen car at 11.0 once in awhile just to shake things up. The current car has been adjusted to run 9.50 as well. That's close to .40 slow. Now staying on the the dial once you get it close, that is another issue. I've been at it a long time. This weekend we managed to stay between 9.227-9.257 on our flat out runs over a wide swing in track temp and weather.
Doug