Strong second for the recommendation of looking at your bearing edges. If you make a lateral move from a Pearl Forum to a Ludwig Centennial then you'll end up with a brand new kit that will also need it's edges worked on to optimize. Guitarists understand that when they buy a new instrument it still needs to be fine tuned. Drummers should take the same approach, especially with non-high end kits. Manufacturers save money on production costs, which means the bearing edges don't get enough attention. This makes things hard to tune, results in dead spots, etc. A nicely edged drum has a wider tuning range and is just nicer to play.