Bad seat height not only affects your posture, but it also affects your technique. I had a battle with this very thing a few years back. I was trying to sit high like a lot of others were doing (I liked the idea of my cymbals being right in front of me). When I started to do this i noticed that my bass drum technique went south. Not thinking, I thought my bass drum pedal was the problem. I then proceeded to go through all the popular brand bass drum pedals. I went from an Flying Dragon, to an Eliminator, Iron Cobra, 5000, and then a 9000. None of them felt right, no matter how I adjusted it. I then decided to lower my seat height a couple inches and it made all the difference in the world. My pedal felt drastically better and I got a horrible feeling in my stomach, having got rid of my Flying Dragon. Overall, make sure your seat height is not impeding on your technique behind the kit.