I see what you're saying. Si/Ne rolls more, and Ni/Se 'clicks' more. And now that you've pointed it out, I tend to 'click' more than not. I was more referring to the direction of the movements than the speed. Good spot on that. I'll be keeping an eye out for it in the future. Heh, see what I did there, eye out. I'm here all week.
Disclaimer: Everything I say here is my OPINION. Please keep that in mind.