Lets see what you've got to show for it.
With my CX:
http://www.youtube.com/watch?v=9RwdkGJH1uk&list=UUlv2lklqlrgu_Vb39UOyoOA&index=10&feature=plcp
---
http://www.youtube.com/watch?v=0h1ndqvKeM4&list=UUlv2lklqlrgu_Vb39UOyoOA&index=7&feature=plcp
---...
No, don't listen to him, you need to go as slow as you possibly can without clipping on the rail, the faster you go the shorter your grind will be and the better chance you have of over shooting the rail.