Suspension tuning question

[derf]

So I rode someone elses 900 today and really noticed the difference in turn in which I can really only attribute to the fact that my bike has been lowered. It was like that when I bought it and I just sorta left it the way it was. So i rode this other 900 today and it handles way better than mine. i had my suspension set up by wheeler last year at the rally and after that i noticed an improvement.

So after work today I take my bike and raise it back up to stock height and take it for a ride. Just like I thought, big difference. Right away the bike is much easier to lean into the corner at speed and holds the line slightly better.

Anyway my real question is about suspension tuning. I had it set to my weight last year by wheeler and was wondering if the bike should be set up again. I can't do it, I just dont understand the black art of suspension tuning