I have been routing with my new Whiteside 1/4" spiral flush trim bit. At full speed "23,000 RPM" it seemed to not be cutting all that good. Don't get me wrong it doing okay I just thought it might do better at a slower speed. So I slowed it down to around 18,000 or 20,000 RPM. I seemed to get a better cut. My question is do you play around with the router speeds to get a better cut?