The trend if you will started around 2007, when Tuner and Shrinker started sharing info. The old Innovate forum, Speed Talk, and Motorsports Village were the sites that originally showed info on idle jet location and Dominator tuneups. Lowering idle feeds, using t-slot jets effectively, and 2 circuit conversions for Dominators are the largest part of it, making the carb idle clean and transition clean make a huge difference in the drivability and most of the time improvement in overall performance.